Implemented the 4 Ruin Abilities

data/battle_scripts_1.s

@@ -8426,6 +8426,12 @@ BattleScript_QuarkDriveActivates::
 	waitmessage B_WAIT_TIME_MED
 	end3
 
+BattleScript_RuinAbilityActivates::
+	call BattleScript_AbilityPopUp
+	printstring STRINGID_ABILITYWEAKENEDFSURROUNDINGMONSSTAT
+	waitmessage B_WAIT_TIME_LONG
+	end3
+
 BattleScript_AttackWeakenedByStrongWinds::
 	pause B_WAIT_TIME_SHORT
 	printstring STRINGID_ATTACKWEAKENEDBSTRONGWINDS

include/battle_scripts.h

@@ -443,6 +443,7 @@ extern const u8 BattleScript_WindPowerActivatesEnd2[];
 extern const u8 BattleScript_ProtosynthesisActivates[];
 extern const u8 BattleScript_QuarkDriveActivates[];
 extern const u8 BattleScript_GoodAsGoldActivates[];
+extern const u8 BattleScript_RuinAbilityActivates[];
 
 // zmoves
 extern const u8 BattleScript_ZMoveActivateDamaging[];

include/constants/battle_string_ids.h

@@ -634,8 +634,9 @@
 #define STRINGID_SUNLIGHTACTIVATEDABILITY             632
 #define STRINGID_STATWASHEIGHTENED                    633
 #define STRINGID_ELECTRICTERRAINACTIVATEDABILITY      634
+#define STRINGID_ABILITYWEAKENEDFSURROUNDINGMONSSTAT  635
 
-#define BATTLESTRINGS_COUNT                           635
+#define BATTLESTRINGS_COUNT                           636
 
 // This is the string id that gBattleStringsTable starts with.
 // String ids before this (e.g. STRINGID_INTROMSG) are not in the table,

src/battle_message.c

@@ -763,9 +763,11 @@ static const u8 sText_BeingHitChargedPkmnWithPower[] = _("Being hit by {B_CURREN
 static const u8 sText_SunlightActivatedAbility[] = _("The harsh sunlight activated\n{B_ATK_NAME_WITH_PREFIX}'s {B_ATK_ABILITY}!");
 static const u8 sText_StatWasHeightened[] = _("{B_ATK_NAME_WITH_PREFIX}'s {B_BUFF1} was heightened!");
 static const u8 sText_ElectricTerrainActivatedAbility[] = _("The Electric Terrain activated\n{B_ATK_NAME_WITH_PREFIX}'s {B_ATK_ABILITY}!");
+static const u8 sText_AbilityWeakenedSurroundingMonsStat[] = _("{B_ATK_NAME_WITH_PREFIX}'s {B_ATK_ABILITY}\nweakened the {B_BUFF1} of\lall surrounding Pokémon!\p");
 
 const u8 *const gBattleStringsTable[BATTLESTRINGS_COUNT] =
 {
+    [STRINGID_ABILITYWEAKENEDFSURROUNDINGMONSSTAT - BATTLESTRINGS_TABLE_START] = sText_AbilityWeakenedSurroundingMonsStat,
     [STRINGID_ELECTRICTERRAINACTIVATEDABILITY - BATTLESTRINGS_TABLE_START] = sText_ElectricTerrainActivatedAbility,
     [STRINGID_STATWASHEIGHTENED - BATTLESTRINGS_TABLE_START] = sText_StatWasHeightened,
     [STRINGID_SUNLIGHTACTIVATEDABILITY - BATTLESTRINGS_TABLE_START] = sText_SunlightActivatedAbility,

src/battle_util.c

@@ -4901,6 +4901,42 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
                 effect++;
             }
             break;
+        case ABILITY_VESSEL_OF_RUIN:
+            if (!gSpecialStatuses[battler].switchInAbilityDone)
+            {
+                PREPARE_STAT_BUFFER(gBattleTextBuff1, STAT_SPATK);
+                gSpecialStatuses[battler].switchInAbilityDone = TRUE;
+                BattleScriptPushCursorAndCallback(BattleScript_RuinAbilityActivates);
+                effect++;
+            }
+            break;
+        case ABILITY_SWORD_OF_RUIN:
+            if (!gSpecialStatuses[battler].switchInAbilityDone)
+            {
+                PREPARE_STAT_BUFFER(gBattleTextBuff1, STAT_DEF);
+                gSpecialStatuses[battler].switchInAbilityDone = TRUE;
+                BattleScriptPushCursorAndCallback(BattleScript_RuinAbilityActivates);
+                effect++;
+            }
+            break;
+        case ABILITY_TABLETS_OF_RUIN:
+            if (!gSpecialStatuses[battler].switchInAbilityDone)
+            {
+                PREPARE_STAT_BUFFER(gBattleTextBuff1, STAT_ATK);
+                gSpecialStatuses[battler].switchInAbilityDone = TRUE;
+                BattleScriptPushCursorAndCallback(BattleScript_RuinAbilityActivates);
+                effect++;
+            }
+            break;
+        case ABILITY_BEADS_OF_RUIN:
+            if (!gSpecialStatuses[battler].switchInAbilityDone)
+            {
+                PREPARE_STAT_BUFFER(gBattleTextBuff1, STAT_SPDEF);
+                gSpecialStatuses[battler].switchInAbilityDone = TRUE;
+                BattleScriptPushCursorAndCallback(BattleScript_RuinAbilityActivates);
+                effect++;
+            }
+            break;
 #if B_WEATHER_FORMS < GEN_5
         default:
             if (gBattleMons[battler].species == SPECIES_CHERRIM)
@@ -8801,6 +8837,18 @@ static u32 CalcMoveBasePowerAfterModifiers(u16 move, u8 battlerAtk, u8 battlerDe
             MulModifier(&modifier, UQ_4_12(1.33));
     }
 
+    if (IsAbilityOnField(ABILITY_VESSEL_OF_RUIN) && atkAbility != ABILITY_VESSEL_OF_RUIN && IS_MOVE_SPECIAL(gCurrentMove))
+        MulModifier(&modifier, UQ_4_12(0.25));
+
+    if (IsAbilityOnField(ABILITY_SWORD_OF_RUIN) && defAbility != ABILITY_SWORD_OF_RUIN && IS_MOVE_PHYSICAL(gCurrentMove))
+        MulModifier(&modifier, UQ_4_12(0.25));
+
+    if (IsAbilityOnField(ABILITY_TABLETS_OF_RUIN) && atkAbility != ABILITY_TABLETS_OF_RUIN && IS_MOVE_PHYSICAL(gCurrentMove))
+        MulModifier(&modifier, UQ_4_12(0.25));
+
+    if (IsAbilityOnField(ABILITY_BEADS_OF_RUIN) && defAbility != ABILITY_BEADS_OF_RUIN && IS_MOVE_SPECIAL(gCurrentMove))
+        MulModifier(&modifier, UQ_4_12(0.25));
+
     // attacker partner's abilities
     if (IsBattlerAlive(BATTLE_PARTNER(battlerAtk)))
     {