diff --git a/data/battle_scripts_1.s b/data/battle_scripts_1.s
index 16ad64b5c..6f93bb12d 100644
--- a/data/battle_scripts_1.s
+++ b/data/battle_scripts_1.s
@@ -410,6 +410,51 @@ gBattleScriptsForMoveEffects::
 	.4byte BattleScript_EffectHit                     @ EFFECT_RISING_VOLTAGE
 	.4byte BattleScript_EffectHit                     @ EFFECT_BEAK_BLAST
 	.4byte BattleScript_EffectCourtChange             @ EFFECT_COURT_CHANGE
+	.4byte BattleScript_EffectSteelBeam               @ EFFECT_STEEL_BEAM
+
+BattleScript_EffectSteelBeam::
+	attackcanceler
+	attackstring
+	ppreduce
+	accuracycheck BattleScript_SteelBeamMiss, ACC_CURR_MOVE
+	critcalc
+	damagecalc
+	adjustdamage
+	attackanimation
+	waitanimation
+	effectivenesssound
+	hitanimation BS_TARGET
+	waitstate
+	healthbarupdate BS_TARGET
+	datahpupdate BS_TARGET
+	critmessage
+	waitmessage B_WAIT_TIME_LONG
+	resultmessage
+	waitmessage B_WAIT_TIME_LONG
+	seteffectwithchance
+	jumpifability BS_ATTACKER, ABILITY_MAGIC_GUARD, BattleScript_SteelBeamAfterSelfDamage
+	call BattleScript_SteelBeamSelfDamage
+BattleScript_SteelBeamAfterSelfDamage::
+	waitstate
+	tryfaintmon BS_ATTACKER
+	tryfaintmon BS_TARGET
+	goto BattleScript_MoveEnd
+BattleScript_SteelBeamMiss::
+	pause B_WAIT_TIME_SHORT
+	effectivenesssound
+	resultmessage
+	waitmessage B_WAIT_TIME_LONG
+	jumpifability BS_ATTACKER, ABILITY_MAGIC_GUARD, BattleScript_MoveEnd
+	bichalfword gMoveResultFlags, MOVE_RESULT_MISSED
+	call BattleScript_SteelBeamSelfDamage
+	orhalfword gMoveResultFlags, MOVE_RESULT_MISSED
+	goto BattleScript_SteelBeamAfterSelfDamage
+
+BattleScript_SteelBeamSelfDamage::
+	dmg_1_2_attackerhp
+	healthbarupdate BS_ATTACKER
+	datahpupdate BS_ATTACKER
+	return
 
 BattleScript_EffectCourtChange::
 	attackcanceler
@@ -1273,6 +1318,7 @@ BattleScript_StrengthSapTryHp:
 	attackanimation
 	waitanimation
 BattleScript_StrengthSapHp:
+	jumpifstatus3 BS_ATTACKER, STATUS3_HEAL_BLOCK, BattleScript_MoveEnd
 	jumpiffullhp BS_ATTACKER, BattleScript_MoveEnd
 	manipulatedamage DMG_BIG_ROOT
 	healthbarupdate BS_ATTACKER
@@ -2109,7 +2155,9 @@ BattleScript_GrowthDoMoveAnim::
 	waitanimation
 	setbyte sSTAT_ANIM_PLAYED, FALSE
 	playstatchangeanimation BS_ATTACKER, BIT_ATK | BIT_SPATK, 0
+.if B_GROWTH_UNDER_SUN >= GEN_5
 	jumpifweatheraffected BS_ATTACKER, B_WEATHER_SUN, BattleScript_GrowthAtk2
+.endif
 	setstatchanger STAT_ATK, 1, FALSE
 	goto BattleScript_GrowthAtk
 BattleScript_GrowthAtk2:
@@ -2120,7 +2168,9 @@ BattleScript_GrowthAtk:
 	printfromtable gStatUpStringIds
 	waitmessage B_WAIT_TIME_LONG
 BattleScript_GrowthTrySpAtk::
+.if B_GROWTH_UNDER_SUN >= GEN_5
 	jumpifweatheraffected BS_ATTACKER, B_WEATHER_SUN, BattleScript_GrowthSpAtk2
+.endif
 	setstatchanger STAT_SPATK, 1, FALSE
 	goto BattleScript_GrowthSpAtk
 BattleScript_GrowthSpAtk2:
@@ -2412,6 +2462,8 @@ BattleScript_EffectHealPulse:
 	attackcanceler
 	attackstring
 	ppreduce
+    jumpifstatus3 BS_ATTACKER, STATUS3_HEAL_BLOCK, BattleScript_MoveUsedHealBlockPrevents @ stops pollen puff
+    jumpifstatus3 BS_TARGET, STATUS3_HEAL_BLOCK, BattleScript_MoveUsedHealBlockPrevents
 	accuracycheck BattleScript_ButItFailed, NO_ACC_CALC_CHECK_LOCK_ON
 	jumpifsubstituteblocks BattleScript_ButItFailed
 	tryhealpulse BS_TARGET, BattleScript_AlreadyAtFullHp
@@ -3106,6 +3158,7 @@ BattleScript_EffectAbsorb::
 	waitmessage B_WAIT_TIME_LONG
 	resultmessage
 	waitmessage B_WAIT_TIME_LONG
+	jumpifstatus3 BS_ATTACKER, STATUS3_HEAL_BLOCK, BattleScript_AbsorbHealBlock
 	setdrainedhp
 	manipulatedamage DMG_BIG_ROOT
 	orword gHitMarker, HITMARKER_IGNORE_SUBSTITUTE | HITMARKER_IGNORE_DISGUISE
@@ -3125,6 +3178,7 @@ BattleScript_AbsorbUpdateHp::
 	waitmessage B_WAIT_TIME_LONG
 BattleScript_AbsorbTryFainting::
 	tryfaintmon BS_ATTACKER
+BattleScript_AbsorbHealBlock::
 	tryfaintmon BS_TARGET
 	goto BattleScript_MoveEnd
 
@@ -3231,6 +3285,7 @@ BattleScript_DreamEaterWorked:
 	waitmessage B_WAIT_TIME_LONG
 	resultmessage
 	waitmessage B_WAIT_TIME_LONG
+	jumpifstatus3 BS_ATTACKER, STATUS3_HEAL_BLOCK, BattleScript_DreamEaterTryFaintEnd
 	setdrainedhp
 	manipulatedamage DMG_BIG_ROOT
 	orword gHitMarker, HITMARKER_IGNORE_SUBSTITUTE
@@ -4536,7 +4591,11 @@ BattleScript_NightmareWorked::
 BattleScript_EffectMinimize::
 	attackcanceler
 	setminimize
+.if B_MINIMIZE_EVASION >= GEN_5
+	setstatchanger STAT_EVASION, 2, FALSE
+.else
 	setstatchanger STAT_EVASION, 1, FALSE
+.endif
 	goto BattleScript_EffectStatUpAfterAtkCanceler
 
 BattleScript_EffectCurse::
@@ -7928,7 +7987,7 @@ BattleScript_DrizzleActivates::
 	call BattleScript_WeatherFormChanges
 	end3
 
-BattleScript_DefiantActivates::
+BattleScript_AbilityRaisesDefenderStat::
 	pause B_WAIT_TIME_SHORT
 	call BattleScript_AbilityPopUp
 	statbuffchange 0, NULL
@@ -8208,8 +8267,10 @@ BattleScript_DesolateLandEvaporatesWaterTypeMoves::
 	attackstring
 	pause B_WAIT_TIME_SHORT
 	ppreduce
+	jumpifword CMP_COMMON_BITS, gHitMarker, HITMARKER_STRING_PRINTED, BattleScript_MoveEnd
 	printstring STRINGID_MOVEEVAPORATEDINTHEHARSHSUNLIGHT
 	waitmessage B_WAIT_TIME_LONG
+	orword gHitMarker, HITMARKER_STRING_PRINTED
 	goto BattleScript_MoveEnd
 
 BattleScript_PrimordialSeaActivates::
@@ -8226,8 +8287,10 @@ BattleScript_PrimordialSeaFizzlesOutFireTypeMoves::
 	attackstring
 	pause B_WAIT_TIME_SHORT
 	ppreduce
+	jumpifword CMP_COMMON_BITS, gHitMarker, HITMARKER_STRING_PRINTED, BattleScript_MoveEnd
 	printstring STRINGID_MOVEFIZZLEDOUTINTHEHEAVYRAIN
 	waitmessage B_WAIT_TIME_LONG
+	orword gHitMarker, HITMARKER_STRING_PRINTED
 	goto BattleScript_MoveEnd
 
 BattleScript_DeltaStreamActivates::
diff --git a/include/battle.h b/include/battle.h
index 4068454bf..fb9c384f0 100644
--- a/include/battle.h
+++ b/include/battle.h
@@ -469,7 +469,6 @@ struct MegaEvolutionData
     bool8 playerSelect;
     u8 triggerSpriteId;
     bool8 isWishMegaEvo;
-    bool8 isPrimalReversion;
 };
 
 struct Illusion
diff --git a/include/battle_scripts.h b/include/battle_scripts.h
index f77431e99..266e8e36e 100644
--- a/include/battle_scripts.h
+++ b/include/battle_scripts.h
@@ -308,7 +308,7 @@ extern const u8 BattleScript_MistySurgeActivates[];
 extern const u8 BattleScript_ElectricSurgeActivates[];
 extern const u8 BattleScript_SpectralThiefSteal[];
 extern const u8 BattleScript_StatUpMsg[];
-extern const u8 BattleScript_DefiantActivates[];
+extern const u8 BattleScript_AbilityRaisesDefenderStat[];
 extern const u8 BattleScript_PowderMoveNoEffect[];
 extern const u8 BattleScript_GrassyTerrainHeals[];
 extern const u8 BattleScript_VCreateStatLoss[];
diff --git a/include/battle_util.h b/include/battle_util.h
index d2d7ac29f..009816631 100644
--- a/include/battle_util.h
+++ b/include/battle_util.h
@@ -134,6 +134,7 @@ u16 CalcPartyMonTypeEffectivenessMultiplier(u16 move, u16 speciesDef, u16 abilit
 u16 GetTypeModifier(u8 atkType, u8 defType);
 s32 GetStealthHazardDamage(u8 hazardType, u8 battlerId);
 u16 GetMegaEvolutionSpecies(u16 preEvoSpecies, u16 heldItemId);
+u16 GetPrimalReversionSpecies(u16 preEvoSpecies, u16 heldItemId);
 u16 GetWishMegaEvolutionSpecies(u16 preEvoSpecies, u16 moveId1, u16 moveId2, u16 moveId3, u16 moveId4);
 bool32 CanMegaEvolve(u8 battlerId);
 void UndoMegaEvolution(u32 monId);
diff --git a/include/constants/battle.h b/include/constants/battle.h
index e5a13205b..d651dab18 100644
--- a/include/constants/battle.h
+++ b/include/constants/battle.h
@@ -203,6 +203,7 @@
 #define HITMARKER_CHARGING              (1 << 27)
 #define HITMARKER_FAINTED(battler)      (gBitTable[battler] << 28)
 #define HITMARKER_FAINTED2(battler)     ((1 << 28) << battler)
+#define HITMARKER_STRING_PRINTED        (1 << 29)
 
 // Per-side statuses that affect an entire party
 #define SIDE_STATUS_REFLECT                 (1 << 0)
diff --git a/include/constants/battle_config.h b/include/constants/battle_config.h
index 8942a45d6..10c7023ef 100644
--- a/include/constants/battle_config.h
+++ b/include/constants/battle_config.h
@@ -99,7 +99,7 @@
 #endif
 
 // Calculation settings
-#define B_CRIT_CHANCE               GEN_7 // Chances of a critical hit landing. See CalcCritChanceStage.
+#define B_CRIT_CHANCE               GEN_7 // Chances of a critical hit landing. See CalcCritChanceStage. Gen6+ chances guarantee that Farfetch'd and Sirfetch'd always get critical hits while holding a Leek and using high-crit ratio moves.
 #define B_CRIT_MULTIPLIER           GEN_7 // In Gen6+, critical hits multiply damage by 1.5 instead of 2.
 #define B_PARALYSIS_SPEED           GEN_7 // In Gen7+, Speed is decreased by 50% instead of 75%.
 #define B_CONFUSION_SELF_DMG_CHANCE GEN_7 // In Gen7+, confusion has a 33.3% of self-damage, instead of 50%.
@@ -116,6 +116,7 @@
 
 // Damage settings
 #define B_BURN_DAMAGE               GEN_7 // In Gen7+, burn damage is 1/16th of max HP instead of 1/8th.
+#define B_BURN_FACADE_DMG           GEN_7 // In Gen6+, burn's effect of lowering the Attack stat no longer applies to Facade.
 #define B_BINDING_DAMAGE            GEN_7 // In Gen6+, binding damage is 1/8 of max HP instead of 1/16. (With Binding Band, 1/6 and 1/8 respectively.)
 #define B_PSYWAVE_DMG               GEN_7 // Psywave's damage formula. See Cmd_psywavedamageeffect.
 #define B_PAYBACK_SWITCH_BOOST      GEN_7 // In Gen5+, if the opponent switches out, Payback's damage will no longer be doubled.
@@ -152,16 +153,18 @@
 #define B_RECOIL_IF_MISS_DMG        GEN_7 // In Gen5+, Jump Kick and High Jump Kick will always do half of the user's max HP when missing.
 #define B_KLUTZ_FLING_INTERACTION   GEN_7 // In Gen5+, Pokémon with the Klutz ability can't use Fling.
 #define B_UPDATED_CONVERSION        GEN_7 // In Gen6+, Conversion changes the user's type to match their first move's. Before, it would choose a move at random.
+#define B_PP_REDUCED_BY_SPITE       GEN_7 // In Gen4+, Spite reduces the foe's last move's PP by 4, instead of 2 to 5.
+#define B_MINIMIZE_EVASION          GEN_7 // In Gen5+, Minimize raises evasion by 2 stages instead of 1.
 
 // Move accuracy settings
 #define B_TOXIC_NEVER_MISS          GEN_7 // In Gen6+, if Toxic is used by a Poison-type Pokémon, it will never miss.
 #define B_MINIMIZE_DMG_ACC          GEN_7 // In Gen6+, moves that causes double damage to minimized Pokémon will also skip accuracy checks.
 #define B_BLIZZARD_HAIL             GEN_7 // In Gen4+, Blizzard bypasses accuracy checks if it's hailing.
+#define B_SHEER_COLD_ACC            GEN_7 // In Gen7+, Sheer Cold's base chance of hitting is reduced to 20% if the user isn't Ice-typed.
 
 // Other move settings
 #define B_SOUND_SUBSTITUTE          GEN_7 // In Gen6+, sound moves bypass Substitute.
 #define B_INCINERATE_GEMS           GEN_7 // In Gen6+, Incinerate can destroy Gems.
-#define B_PP_REDUCED_BY_SPITE       GEN_7 // In Gen4+, Spite reduces the foe's last move's PP by 4, instead of 2 to 5.
 #define B_CAN_SPITE_FAIL            GEN_7 // In Gen4+, Spite can no longer fail if the foe's last move only has 1 remaining PP.
 #define B_CRASH_IF_TARGET_IMMUNE    GEN_7 // In Gen4+, The user of Jump Kick or High Jump Kick will "keep going and crash" if it attacks a target that is immune to the move.
 #define B_MEMENTO_FAIL              GEN_7 // In Gen4+, Memento fails if there is no target or if the target is protected or behind substitute. But not if Atk/Sp. Atk are at -6.
@@ -170,6 +173,10 @@
 #define B_BRICK_BREAK               GEN_7 // In Gen4+, you can destroy your own side's screens. In Gen 5+, screens are not removed if the target is immune.
 #define B_WISH_HP_SOURCE            GEN_7 // In Gen5+, Wish heals half of the user's max HP instead of the target's.
 #define B_RAMPAGE_CANCELLING        GEN_7 // In Gen5+, a failed Thrash, etc, will cancel except on its last turn.
+#define B_HEAL_BLOCKING             GEN_7 // In Gen5+, Heal Block prevents healing by Black Sludge, Leftovers, Shell Bell. Affected Pokémon will not consume held HP-restoring Berries or Berry Juice.
+                                          // Draining abilities will not heal but will prevent damage. In Gen6+, Heal Block prevents the use of most HP-draining moves.
+#define B_ROOTED_GROUNDING          GEN_7 // In Gen4+, Ingrain causes the affected Pokémon to become grounded.
+#define B_GROWTH_UNDER_SUN          GEN_7 // In Gen5+, Growth's effects are doubled when under the effects of the sun.
 
 // Ability settings
 #define B_EXPANDED_ABILITY_NAMES    TRUE  // If TRUE, ability names are increased from 12 characters to 16 characters.
@@ -185,6 +192,7 @@
 #define B_OBLIVIOUS_TAUNT           GEN_7 // In Gen6+, Pokémon with Oblivious can't be taunted.
 #define B_SYMBIOSIS_GEMS            GEN_7 // In Gen 6, Symbiosis passes an item before the gem-boosted attack hits and the item effect applies. In Gen 7+, items are passed after a gem-boosted attack.
 
+
 // Item settings
 #define B_HP_BERRIES                GEN_7 // In Gen4+, berries which restore hp activate immediately after HP drops to half. In Gen3, the effect occurs at the end of the turn.
 #define B_BERRIES_INSTANT           GEN_7 // In Gen4+, most berries activate on battle start/switch-in if applicable. In Gen3, they only activate either at the move end or turn end.
@@ -203,7 +211,6 @@
 #define B_HEAVY_BALL_MODIFIER       GEN_7 // In Gen7+, Heavy Ball's ranges change. See Cmd_handleballthrow.
 #define B_DREAM_BALL_MODIFIER       GEN_8 // In Gen8, Dream Ball's catch multiplier is x4 when the target is asleep or has the ability Comatose.
 #define B_SERENE_GRACE_BOOST        GEN_7 // In Gen5+, Serene Grace boosts the added flinch chance of King's Rock and Razor Fang.
-#define B_LEEK_ALWAYS_CRIT          GEN_7 // In Gen6+, if a Farfetch'd or Sirfetch'd holding a Leek use a move with increased Critical Hit ratio, it will always result in a Critical Hit.
 
 // Flag settings
 // To use the following features in scripting, replace the 0s with the flag ID you're assigning it to.
diff --git a/include/constants/battle_move_effects.h b/include/constants/battle_move_effects.h
index 3cc3d72b3..c3460bcfe 100644
--- a/include/constants/battle_move_effects.h
+++ b/include/constants/battle_move_effects.h
@@ -393,7 +393,8 @@
 #define EFFECT_RISING_VOLTAGE 387
 #define EFFECT_BEAK_BLAST 388
 #define EFFECT_COURT_CHANGE 389
+#define EFFECT_STEEL_BEAM 390
 
-#define NUM_BATTLE_MOVE_EFFECTS 390
+#define NUM_BATTLE_MOVE_EFFECTS 391
 
 #endif  // GUARD_CONSTANTS_BATTLE_MOVE_EFFECTS_H
diff --git a/src/battle_ai_util.c b/src/battle_ai_util.c
index de4271bba..8ed6e0490 100644
--- a/src/battle_ai_util.c
+++ b/src/battle_ai_util.c
@@ -1499,6 +1499,10 @@ bool32 ShouldTryOHKO(u8 battlerAtk, u8 battlerDef, u16 atkAbility, u16 defAbilit
     else    // test the odds
     {
         u16 odds = accuracy + (gBattleMons[battlerAtk].level - gBattleMons[battlerDef].level);
+        #if B_SHEER_COLD_ACC >= GEN_7
+            if (gCurrentMove == MOVE_SHEER_COLD && !IS_BATTLER_OF_TYPE(gBattlerAttacker, TYPE_ICE))
+                odds -= 10;
+        #endif
         if (Random() % 100 + 1 < odds && gBattleMons[battlerAtk].level >= gBattleMons[battlerDef].level)
             return TRUE;
     }
diff --git a/src/battle_main.c b/src/battle_main.c
index 479cafae6..f260e5aaf 100644
--- a/src/battle_main.c
+++ b/src/battle_main.c
@@ -64,6 +64,8 @@
 #include "constants/trainers.h"
 #include "cable_club.h"
 
+extern struct Evolution gEvolutionTable[][EVOS_PER_MON];
+
 extern const struct BgTemplate gBattleBgTemplates[];
 extern const struct WindowTemplate *const gBattleWindowTemplates[];
 
@@ -3635,12 +3637,18 @@ static void TryDoEventsBeforeFirstTurn(void)
     // Primal Reversion
     for (i = 0; i < gBattlersCount; i++)
     {
-        if (CanMegaEvolve(i)
-         && GetBattlerHoldEffect(i, TRUE) == HOLD_EFFECT_PRIMAL_ORB)
+        if (GetBattlerHoldEffect(i, TRUE) == HOLD_EFFECT_PRIMAL_ORB)
         {
-            gBattlerAttacker = i;
-            BattleScriptExecute(BattleScript_PrimalReversion);
-            return;
+            for (j = 0; j < EVOS_PER_MON; j++)
+            {
+                if (gEvolutionTable[gBattleMons[i].species][j].targetSpecies != SPECIES_NONE
+                 && gEvolutionTable[gBattleMons[i].species][j].method == EVO_PRIMAL_REVERSION)
+                {
+                    gBattlerAttacker = i;
+                    BattleScriptExecute(BattleScript_PrimalReversion);
+                    return;
+                }
+            }
         }
     }
 
@@ -4020,7 +4028,8 @@ static void HandleTurnActionSelectionState(void)
                     {
                         BtlController_EmitChoosePokemon(BUFFER_A, PARTY_ACTION_CANT_SWITCH, PARTY_SIZE, ABILITY_NONE, gBattleStruct->battlerPartyOrders[gActiveBattler]);
                     }
-                    else if ((i = IsAbilityPreventingEscape(gActiveBattler)))
+                    else if ((i = IsAbilityPreventingEscape(gActiveBattler)
+                              && ItemId_GetHoldEffect(gBattleMons[gActiveBattler].item) != HOLD_EFFECT_SHED_SHELL))
                     {
                         BtlController_EmitChoosePokemon(BUFFER_A, ((i - 1) << 4) | PARTY_ACTION_ABILITY_PREVENTS, PARTY_SIZE, gBattleMons[i - 1].ability, gBattleStruct->battlerPartyOrders[gActiveBattler]);
                     }
diff --git a/src/battle_message.c b/src/battle_message.c
index d5c6844bc..50c71bc33 100644
--- a/src/battle_message.c
+++ b/src/battle_message.c
@@ -220,7 +220,7 @@ static const u8 sText_PkmnForesawAttack[] = _("{B_ATK_NAME_WITH_PREFIX} foresaw\
 static const u8 sText_PkmnTookAttack[] = _("{B_DEF_NAME_WITH_PREFIX} took the\n{B_BUFF1} attack!");
 static const u8 sText_PkmnChoseXAsDestiny[] = _("{B_ATK_NAME_WITH_PREFIX} chose\n{B_CURRENT_MOVE} as its destiny!");
 static const u8 sText_PkmnAttack[] = _("{B_BUFF1}'s attack!");
-static const u8 sText_PkmnCenterAttention[] = _("{B_ATK_NAME_WITH_PREFIX} became the\ncenter of attention!");
+static const u8 sText_PkmnCenterAttention[] = _("{B_DEF_NAME_WITH_PREFIX} became the\ncenter of attention!");
 static const u8 sText_PkmnChargingPower[] = _("{B_ATK_NAME_WITH_PREFIX} began\ncharging power!");
 static const u8 sText_NaturePowerTurnedInto[] = _("NATURE POWER turned into\n{B_CURRENT_MOVE}!");
 static const u8 sText_PkmnStatusNormal[] = _("{B_ATK_NAME_WITH_PREFIX}'s status\nreturned to normal!");
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index f145025ce..948aaeca6 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -1358,24 +1358,20 @@ static void Cmd_attackcanceler(void)
 
     GET_MOVE_TYPE(gCurrentMove, moveType);
 
-    if (moveType == TYPE_FIRE
-     && (gBattleWeather & B_WEATHER_RAIN_PRIMAL)
-     && WEATHER_HAS_EFFECT
-     && gBattleMoves[gCurrentMove].power)
+    if (WEATHER_HAS_EFFECT && gBattleMoves[gCurrentMove].power)
     {
-        BattleScriptPushCursor();
-        gBattlescriptCurrInstr = BattleScript_PrimordialSeaFizzlesOutFireTypeMoves;
-        return;
-    }
-
-    if (moveType == TYPE_WATER
-     && (gBattleWeather & B_WEATHER_SUN_PRIMAL)
-     && WEATHER_HAS_EFFECT
-     && gBattleMoves[gCurrentMove].power)
-    {
-        BattleScriptPushCursor();
-        gBattlescriptCurrInstr = BattleScript_DesolateLandEvaporatesWaterTypeMoves;
-        return;
+        if (moveType == TYPE_FIRE && (gBattleWeather & B_WEATHER_RAIN_PRIMAL))
+        {
+            BattleScriptPushCursor();
+            gBattlescriptCurrInstr = BattleScript_PrimordialSeaFizzlesOutFireTypeMoves;
+            return;
+        }
+        else if (moveType == TYPE_WATER && (gBattleWeather & B_WEATHER_SUN_PRIMAL))
+        {
+            BattleScriptPushCursor();
+            gBattlescriptCurrInstr = BattleScript_DesolateLandEvaporatesWaterTypeMoves;
+            return;
+        }
     }
 
     if (gBattleOutcome != 0)
@@ -1879,11 +1875,7 @@ s32 CalcCritChanceStage(u8 battlerAtk, u8 battlerDef, u32 move, bool32 recordAbi
     else if (gStatuses3[battlerAtk] & STATUS3_LASER_FOCUS
              || gBattleMoves[move].effect == EFFECT_ALWAYS_CRIT
              || (abilityAtk == ABILITY_MERCILESS && gBattleMons[battlerDef].status1 & STATUS1_PSN_ANY)
-             || move == MOVE_SURGING_STRIKES
-            #if B_LEEK_ALWAYS_CRIT >= GEN_6
-             || ((gBattleMoves[gCurrentMove].flags & FLAG_HIGH_CRIT) && BENEFITS_FROM_LEEK(battlerAtk, holdEffectAtk))
-            #endif
-             )
+             || move == MOVE_SURGING_STRIKES)
     {
         critChance = -2;
     }
@@ -7942,7 +7934,7 @@ static void Cmd_various(void)
             gBattlescriptCurrInstr = T1_READ_PTR(gBattlescriptCurrInstr + 3);
         return;
     case VARIOUS_CHECK_IF_GRASSY_TERRAIN_HEALS:
-        if ((gStatuses3[gActiveBattler] & (STATUS3_SEMI_INVULNERABLE))
+        if ((gStatuses3[gActiveBattler] & (STATUS3_SEMI_INVULNERABLE | STATUS3_HEAL_BLOCK))
             || BATTLER_MAX_HP(gActiveBattler)
             || !gBattleMons[gActiveBattler].hp
             || !(IsBattlerGrounded(gActiveBattler)))
@@ -8617,7 +8609,7 @@ static void Cmd_various(void)
                 gBattleStruct->mega.playerPrimalRevertedSpecies = gBattleStruct->mega.primalRevertedSpecies[gActiveBattler];
             }
             // Checks Primal Reversion
-            primalSpecies = GetMegaEvolutionSpecies(gBattleStruct->mega.primalRevertedSpecies[gActiveBattler], gBattleMons[gActiveBattler].item);
+            primalSpecies = GetPrimalReversionSpecies(gBattleStruct->mega.primalRevertedSpecies[gActiveBattler], gBattleMons[gActiveBattler].item);
 
             gBattleMons[gActiveBattler].species = primalSpecies;
             PREPARE_SPECIES_BUFFER(gBattleTextBuff1, gBattleMons[gActiveBattler].species);
@@ -9951,7 +9943,7 @@ static void Cmd_manipulatedamage(void)
         gBattleMoveDamage = GetDrainedBigRootHp(gBattlerAttacker, gBattleMoveDamage);
         break;
     case DMG_1_2_ATTACKER_HP:
-        gBattleMoveDamage = gBattleMons[gBattlerAttacker].maxHP / 2;
+        gBattleMoveDamage = (gBattleMons[gBattlerAttacker].maxHP + 1) / 2; // Half of Max HP Rounded UP
         break;
     case DMG_RECOIL_FROM_IMMUNE:
         gBattleMoveDamage = gBattleMons[gBattlerTarget].maxHP / 2;
@@ -10971,6 +10963,10 @@ static void Cmd_tryKO(void)
         else
         {
             u16 odds = gBattleMoves[gCurrentMove].accuracy + (gBattleMons[gBattlerAttacker].level - gBattleMons[gBattlerTarget].level);
+            #if B_SHEER_COLD_ACC >= GEN_7
+                if (gCurrentMove == MOVE_SHEER_COLD && !IS_BATTLER_OF_TYPE(gBattlerAttacker, TYPE_ICE))
+                    odds -= 10;
+            #endif
             if (Random() % 100 + 1 < odds && gBattleMons[gBattlerAttacker].level >= gBattleMons[gBattlerTarget].level)
                 lands = TRUE;
         }
@@ -12466,9 +12462,9 @@ static void Cmd_jumpifattackandspecialattackcannotfall(void) // memento
 
 static void Cmd_setforcedtarget(void) // follow me
 {
-    gSideTimers[GetBattlerSide(gBattlerAttacker)].followmeTimer = 1;
-    gSideTimers[GetBattlerSide(gBattlerAttacker)].followmeTarget = gBattlerAttacker;
-    gSideTimers[GetBattlerSide(gBattlerAttacker)].followmePowder = TestMoveFlags(gCurrentMove, FLAG_POWDER);
+    gSideTimers[GetBattlerSide(gBattlerTarget)].followmeTimer = 1;
+    gSideTimers[GetBattlerSide(gBattlerTarget)].followmeTarget = gBattlerTarget;
+    gSideTimers[GetBattlerSide(gBattlerTarget)].followmePowder = TestMoveFlags(gCurrentMove, FLAG_POWDER);
     gBattlescriptCurrInstr++;
 }
 
@@ -12543,13 +12539,16 @@ static void Cmd_jumpifnodamage(void)
 
 static void Cmd_settaunt(void)
 {
+#if B_OBLIVIOUS_TAUNT >= GEN_6
     if (GetBattlerAbility(gBattlerTarget) == ABILITY_OBLIVIOUS)
     {
         gBattlescriptCurrInstr = BattleScript_NotAffectedAbilityPopUp;
         gLastUsedAbility = ABILITY_OBLIVIOUS;
         RecordAbilityBattle(gBattlerTarget, ABILITY_OBLIVIOUS);
     }
-    else if (gDisableStructs[gBattlerTarget].tauntTimer == 0)
+    else
+#endif
+    if (gDisableStructs[gBattlerTarget].tauntTimer == 0)
     {
         #if B_TAUNT_TURNS >= GEN_5
             u8 turns = 4;
diff --git a/src/battle_util.c b/src/battle_util.c
index c0a7f2150..30df20f4f 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -1575,12 +1575,22 @@ void PrepareStringBattle(u16 stringId, u8 battler)
         gBattleScripting.stickyWebStatDrop = 0;
         gBattlerAbility = gBattlerTarget;
         BattleScriptPushCursor();
-        gBattlescriptCurrInstr = BattleScript_DefiantActivates;
+        gBattlescriptCurrInstr = BattleScript_AbilityRaisesDefenderStat;
         if (targetAbility == ABILITY_DEFIANT)
             SET_STATCHANGER(STAT_ATK, 2, FALSE);
         else
             SET_STATCHANGER(STAT_SPATK, 2, FALSE);
     }
+#if  B_UPDATED_INTIMIDATE >= GEN_8
+    else if (stringId == STRINGID_PKMNCUTSATTACKWITH && targetAbility == ABILITY_RATTLED
+            && CompareStat(gBattlerTarget, STAT_SPEED, MAX_STAT_STAGE, CMP_LESS_THAN))
+    {
+        gBattlerAbility = gBattlerTarget;
+        BattleScriptPushCursor();
+        gBattlescriptCurrInstr = BattleScript_AbilityRaisesDefenderStat;
+        SET_STATCHANGER(STAT_SPEED, 1, FALSE);
+    }
+#endif
 
     gActiveBattler = battler;
     BtlController_EmitPrintString(BUFFER_A, stringId);
@@ -1680,7 +1690,11 @@ bool32 IsHealBlockPreventingMove(u32 battler, u32 move)
 
     switch (gBattleMoves[move].effect)
     {
+#if B_HEAL_BLOCKING >= GEN_6
     case EFFECT_ABSORB:
+    case EFFECT_STRENGTH_SAP:
+    case EFFECT_DREAM_EATER:
+#endif
     case EFFECT_MORNING_SUN:
     case EFFECT_MOONLIGHT:
     case EFFECT_RESTORE_HP:
@@ -1688,7 +1702,7 @@ bool32 IsHealBlockPreventingMove(u32 battler, u32 move)
     case EFFECT_ROOST:
     case EFFECT_HEALING_WISH:
     case EFFECT_WISH:
-    case EFFECT_DREAM_EATER:
+    case EFFECT_HEAL_PULSE:
         return TRUE;
     default:
         return FALSE;
@@ -4907,7 +4921,11 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
 
             if (effect == 1) // Drain Hp ability.
             {
+#if B_HEAL_BLOCKING >= GEN_5                
                 if (BATTLER_MAX_HP(battler) || gStatuses3[battler] & STATUS3_HEAL_BLOCK)
+#else
+                if (BATTLER_MAX_HP(battler))
+#endif
                 {
                     if ((gProtectStructs[gBattlerAttacker].notFirstStrike))
                         gBattlescriptCurrInstr = BattleScript_MonMadeMoveUseless;
@@ -6082,7 +6100,11 @@ bool32 HasEnoughHpToEatBerry(u32 battlerId, u32 hpFraction, u32 itemId)
 
 static u8 HealConfuseBerry(u32 battlerId, u32 itemId, u8 flavorId, bool32 end2)
 {
+#if B_HEAL_BLOCKING >= GEN_5
+    if (HasEnoughHpToEatBerry(battlerId, 2, itemId) && !(gStatuses3[battlerId] & STATUS3_HEAL_BLOCK))
+#else
     if (HasEnoughHpToEatBerry(battlerId, 2, itemId))
+#endif
     {
         PREPARE_FLAVOR_BUFFER(gBattleTextBuff1, flavorId);
 
@@ -6268,7 +6290,11 @@ u8 TryHandleSeed(u8 battler, u32 terrainFlag, u8 statId, u16 itemId, bool32 exec
 
 static u8 ItemHealHp(u32 battlerId, u32 itemId, bool32 end2, bool32 percentHeal)
 {
+#if B_HEAL_BLOCKING >= GEN_5
+    if (HasEnoughHpToEatBerry(battlerId, 2, itemId) && !(gStatuses3[battlerId] & STATUS3_HEAL_BLOCK)
+#else
     if (HasEnoughHpToEatBerry(battlerId, 2, itemId)
+#endif
       && !(gBattleScripting.overrideBerryRequirements && gBattleMons[battlerId].hp == gBattleMons[battlerId].maxHP))
     {
         if (percentHeal)
@@ -6707,7 +6733,11 @@ u8 ItemBattleEffects(u8 caseID, u8 battlerId, bool8 moveTurn)
                 break;
             case HOLD_EFFECT_LEFTOVERS:
             LEFTOVERS:
+#if B_HEAL_BLOCKING >= GEN_5
+                if (gBattleMons[battlerId].hp < gBattleMons[battlerId].maxHP && !moveTurn && !(gStatuses3[battlerId] & STATUS3_HEAL_BLOCK))
+#else
                 if (gBattleMons[battlerId].hp < gBattleMons[battlerId].maxHP && !moveTurn)
+#endif
                 {
                     gBattleMoveDamage = gBattleMons[battlerId].maxHP / 16;
                     if (gBattleMoveDamage == 0)
@@ -7137,7 +7167,11 @@ u8 ItemBattleEffects(u8 caseID, u8 battlerId, bool8 moveTurn)
             if (gSpecialStatuses[gBattlerAttacker].damagedMons  // Need to have done damage
                 && gBattlerAttacker != gBattlerTarget
                 && gBattleMons[gBattlerAttacker].hp != gBattleMons[gBattlerAttacker].maxHP
+#if B_HEAL_BLOCKING >= GEN_5
+                && gBattleMons[gBattlerAttacker].hp != 0 && !(gStatuses3[battlerId] & STATUS3_HEAL_BLOCK))
+#else
                 && gBattleMons[gBattlerAttacker].hp != 0)
+#endif
             {
                 gLastUsedItem = atkItem;
                 gPotentialItemEffectBattler = gBattlerAttacker;
@@ -7734,8 +7768,10 @@ bool32 IsBattlerGrounded(u8 battlerId)
         return TRUE;
     else if (gFieldStatuses & STATUS_FIELD_GRAVITY)
         return TRUE;
+#if B_ROOTED_GROUNDING >= GEN_4
     else if (gStatuses3[battlerId] & STATUS3_ROOTED)
         return TRUE;
+#endif
     else if (gStatuses3[battlerId] & STATUS3_SMACKED_DOWN)
         return TRUE;
 
@@ -8119,7 +8155,8 @@ static u16 CalcMoveBasePower(u16 move, u8 battlerAtk, u8 battlerDef)
             basePower *= 2;
         break;
     case EFFECT_BOLT_BEAK:
-        if (GetBattlerTurnOrderNum(battlerAtk) < GetBattlerTurnOrderNum(battlerDef))
+        if (GetBattlerTurnOrderNum(battlerAtk) < GetBattlerTurnOrderNum(battlerDef)
+            || gDisableStructs[battlerDef].isFirstTurn == 2)
             basePower *= 2;
         break;
     case EFFECT_ROUND:
@@ -8875,7 +8912,8 @@ static u32 CalcFinalDmg(u32 dmg, u16 move, u8 battlerAtk, u8 battlerDef, u8 move
 
     // check burn
     if (gBattleMons[battlerAtk].status1 & STATUS1_BURN && IS_MOVE_PHYSICAL(move)
-        && gBattleMoves[move].effect != EFFECT_FACADE && abilityAtk != ABILITY_GUTS)
+        && (gBattleMoves[move].effect != EFFECT_FACADE || B_BURN_FACADE_DMG < GEN_6)
+        && abilityAtk != ABILITY_GUTS)
         dmg = ApplyModifier(UQ_4_12(0.5), dmg);
 
     // check sunny/rain weather
@@ -9281,8 +9319,20 @@ u16 GetMegaEvolutionSpecies(u16 preEvoSpecies, u16 heldItemId)
 
     for (i = 0; i < EVOS_PER_MON; i++)
     {
-        if ((gEvolutionTable[preEvoSpecies][i].method == EVO_MEGA_EVOLUTION
-         || gEvolutionTable[preEvoSpecies][i].method == EVO_PRIMAL_REVERSION)
+        if (gEvolutionTable[preEvoSpecies][i].method == EVO_MEGA_EVOLUTION
+         && gEvolutionTable[preEvoSpecies][i].param == heldItemId)
+            return gEvolutionTable[preEvoSpecies][i].targetSpecies;
+    }
+    return SPECIES_NONE;
+}
+
+u16 GetPrimalReversionSpecies(u16 preEvoSpecies, u16 heldItemId)
+{
+    u32 i;
+
+    for (i = 0; i < EVOS_PER_MON; i++)
+    {
+        if (gEvolutionTable[preEvoSpecies][i].method == EVO_PRIMAL_REVERSION
          && gEvolutionTable[preEvoSpecies][i].param == heldItemId)
             return gEvolutionTable[preEvoSpecies][i].targetSpecies;
     }
@@ -9323,12 +9373,10 @@ bool32 CanMegaEvolve(u8 battlerId)
     // Check if trainer already mega evolved a pokemon.
     if (mega->alreadyEvolved[battlerPosition])
         return FALSE;
-    if (gBattleTypeFlags & BATTLE_TYPE_DOUBLE)
-    {
-        if (IsPartnerMonFromSameTrainer(battlerId)
-            && (mega->alreadyEvolved[partnerPosition] || (mega->toEvolve & gBitTable[BATTLE_PARTNER(battlerId)])))
-            return FALSE;
-    }
+    if (gBattleTypeFlags & BATTLE_TYPE_DOUBLE
+     && IsPartnerMonFromSameTrainer(battlerId)
+     && (mega->alreadyEvolved[partnerPosition] || (mega->toEvolve & gBitTable[BATTLE_PARTNER(battlerId)])))
+        return FALSE;
 
     // Check if mon is currently held by Sky Drop
     if (gStatuses3[battlerId] & STATUS3_SKY_DROPPED)
@@ -9364,14 +9412,6 @@ bool32 CanMegaEvolve(u8 battlerId)
             gBattleStruct->mega.isWishMegaEvo = FALSE;
             return TRUE;
         }
-
-        // Can undergo Primal Reversion.
-        if (holdEffect == HOLD_EFFECT_PRIMAL_ORB)
-        {
-            gBattleStruct->mega.isWishMegaEvo = FALSE;
-            gBattleStruct->mega.isPrimalReversion = TRUE;
-            return TRUE;
-        }
     }
 
     // Check if there is an entry in the evolution table for Wish Mega Evolution.
@@ -9476,9 +9516,8 @@ bool32 CanBattlerGetOrLoseItem(u8 battlerId, u16 itemId)
     // Mail can be stolen now
     if (itemId == ITEM_ENIGMA_BERRY)
         return FALSE;
-    else if (GET_BASE_SPECIES_ID(species) == SPECIES_KYOGRE && itemId == ITEM_BLUE_ORB) // includes primal
-        return FALSE;
-    else if (GET_BASE_SPECIES_ID(species) == SPECIES_GROUDON && itemId == ITEM_RED_ORB) // includes primal
+    // Primal Reversion inducing items cannot be lost if pokemon's base species can undergo primal reversion with it.
+    else if (holdEffect == HOLD_EFFECT_PRIMAL_ORB && (GetPrimalReversionSpecies(GET_BASE_SPECIES_ID(species), itemId) != SPECIES_NONE))
         return FALSE;
     // Mega stone cannot be lost if pokemon's base species can mega evolve with it.
     else if (holdEffect == HOLD_EFFECT_MEGA_STONE && (GetMegaEvolutionSpecies(GET_BASE_SPECIES_ID(species), itemId) != SPECIES_NONE))
diff --git a/src/data/battle_moves.h b/src/data/battle_moves.h
index 1f90abf03..2035acff7 100644
--- a/src/data/battle_moves.h
+++ b/src/data/battle_moves.h
@@ -11221,7 +11221,7 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
 
     [MOVE_STEEL_BEAM] =
     {
-        .effect = EFFECT_RECOIL_50,
+        .effect = EFFECT_STEEL_BEAM,
         .power = 140,
         .type = TYPE_STEEL,
         .accuracy = 95,
diff --git a/src/data/text/move_descriptions.h b/src/data/text/move_descriptions.h
index 942ab0fbf..5f6bcfb0e 100644
--- a/src/data/text/move_descriptions.h
+++ b/src/data/text/move_descriptions.h
@@ -79,7 +79,11 @@ static const u8 sFlyDescription[] = _(
 
 static const u8 sBindDescription[] = _(
     "Binds and squeezes the foe\n"
+#if B_BINDING_TURNS >= GEN_5
+    "for 4 or 5 turns.");
+#else
     "for 2 to 5 turns.");
+#endif
 
 static const u8 sSlamDescription[] = _(
     "Slams the foe with a long\n"
@@ -139,7 +143,11 @@ static const u8 sBodySlamDescription[] = _(
 
 static const u8 sWrapDescription[] = _(
     "Wraps and squeezes the foe\n"
+#if B_BINDING_TURNS >= GEN_5
+    "4 or 5 times with vines, etc.");
+#else
     "2 to 5 times with vines, etc.");
+#endif
 
 static const u8 sTakeDownDescription[] = _(
     "A reckless charge attack\n"
@@ -331,7 +339,11 @@ static const u8 sDragonRageDescription[] = _(
 
 static const u8 sFireSpinDescription[] = _(
     "Traps the foe in a ring of\n"
+#if B_BINDING_TURNS >= GEN_5
+    "fire for 4 or 5 turns.");
+#else
     "fire for 2 to 5 turns.");
+#endif
 
 static const u8 sThunderShockDescription[] = _(
     "An electrical attack that\n"
@@ -511,7 +523,11 @@ static const u8 sWaterfallDescription[] = _(
 
 static const u8 sClampDescription[] = _(
     "Traps and squeezes the\n"
+#if B_BINDING_TURNS >= GEN_5
+    "foe for 4 or 5 turns.");
+#else
     "foe for 2 to 5 turns.");
+#endif
 
 static const u8 sSwiftDescription[] = _(
     "Sprays star-shaped rays\n"
@@ -999,7 +1015,11 @@ static const u8 sRockSmashDescription[] = _(
 
 static const u8 sWhirlpoolDescription[] = _(
     "Traps and hurts the foe in\n"
+#if B_BINDING_TURNS >= GEN_5
+    "a whirlpool for 4 or 5 turns.");
+#else
     "a whirlpool for 2 to 5 turns.");
+#endif
 
 static const u8 sBeatUpDescription[] = _(
     "Summons party Pokémon to\n"
@@ -1311,7 +1331,11 @@ static const u8 sSkyUppercutDescription[] = _(
 
 static const u8 sSandTombDescription[] = _(
     "Traps and hurts the foe in\n"
+#if B_BINDING_TURNS >= GEN_5
+    "quicksand for 4 or 5 turns.");
+#else
     "quicksand for 2 to 5 turns.");
+#endif
 
 static const u8 sSheerColdDescription[] = _(
     "A chilling attack that\n"
@@ -1815,7 +1839,11 @@ static const u8 sSpacialRendDescription[] = _(
 
 static const u8 sMagmaStormDescription[] = _(
     "Traps the foe in a vortex\n"
+#if B_BINDING_TURNS >= GEN_5
+    "of fire for 4 or 5 turns.");
+#else
     "of fire for 2 to 5 turns.");
+#endif
 
 static const u8 sDarkVoidDescription[] = _(
     "Drags the foe into total\n"
@@ -2367,7 +2395,11 @@ static const u8 sNuzzleDescription[] = _(
 
 static const u8 sInfestationDescription[] = _(
     "The foe is infested and\n"
+#if B_BINDING_TURNS >= GEN_5
+    "attacked for 4 or 5 turns.");
+#else
     "attacked for 2 to 5 turns.");
+#endif
 
 static const u8 sPowerUpPunchDescription[] = _(
     "A hard punch that raises\n"
@@ -2912,7 +2944,11 @@ static const u8 sSurgingStrikesDescription[] = _(
 
 static const u8 sThunderCageDescription[] = _(
     "Traps the foe in a cage of\n"
+#if B_BINDING_TURNS >= GEN_5
+    "electricity for 4 or 5 turns.");
+#else
     "electricity for 2 to 5 turns.");
+#endif
 
 static const u8 sDragonEnergyDescription[] = _(
     "The higher the user's HP\n"