Implement Gorilla Tactics

It's Choice Band but as an ability.

data/battle_scripts_1.s

@@ -8502,6 +8502,10 @@ BattleScript_SelectingNotAllowedMoveChoiceItem::
 	printselectionstring STRINGID_ITEMALLOWSONLYYMOVE
 	endselectionscript
 
+BattleScript_SelectingNotAllowedMoveGorillaTactics::
+	printselectionstring STRINGID_ABILITYALLOWSONLYMOVE
+	endselectionscript
+
 BattleScript_SelectingNotAllowedMoveAssaultVest::
 	printselectionstring STRINGID_ASSAULTVESTDOESNTALLOW
 	endselectionscript

include/battle_scripts.h

@@ -402,5 +402,6 @@ extern const u8 BattleScript_BlockedByPrimalWeatherEnd3[];
 extern const u8 BattleScript_BlockedByPrimalWeatherRet[];
 extern const u8 BattleScript_PrimalReversion[];
 extern const u8 BattleScript_HyperspaceFuryRemoveProtect[];
+extern const u8 BattleScript_SelectingNotAllowedMoveGorillaTactics[];
 
 #endif // GUARD_BATTLE_SCRIPTS_H

include/constants/battle_string_ids.h

@@ -597,8 +597,9 @@
 #define STRINGID_BUTPOKEMONCANTUSETHEMOVE             594
 #define STRINGID_BUTHOOPACANTUSEIT                    595
 #define STRINGID_BROKETHROUGHPROTECTION               596
+#define STRINGID_ABILITYALLOWSONLYMOVE                597
 
-#define BATTLESTRINGS_COUNT                           597
+#define BATTLESTRINGS_COUNT                           598
 
 // The below IDs are all indexes into battle message tables,
 // used to determine which of a set of messages to print.

src/battle_message.c

@@ -723,9 +723,11 @@ static const u8 sText_PkmnRevertedToPrimal[] = _("{B_ATK_NAME_WITH_PREFIX}'s Pri
 static const u8 sText_ButPokemonCantUseTheMove[] = _("But {B_ATK_NAME_WITH_PREFIX} can't\nuse the move!");
 static const u8 sText_ButHoopaCantUseIt[] = _("But Hoopa can't use it\nthe way it is now!");
 static const u8 sText_BrokeThroughProtection[] = _("It broke through the\n{B_DEF_NAME_WITH_PREFIX}'s protection!");
+static const u8 sText_AbilityAllowsOnlyMove[] = _("{B_ATK_ABILITY} allows the\nuse of only {B_CURRENT_MOVE}!\p");
 
 const u8 *const gBattleStringsTable[BATTLESTRINGS_COUNT] =
 {
+    [STRINGID_ABILITYALLOWSONLYMOVE - 12] = sText_AbilityAllowsOnlyMove,
     [STRINGID_BROKETHROUGHPROTECTION - 12] = sText_BrokeThroughProtection,
     [STRINGID_BUTPOKEMONCANTUSETHEMOVE - 12] = sText_ButPokemonCantUseTheMove,
     [STRINGID_BUTHOOPACANTUSEIT - 12] = sText_ButHoopaCantUseIt,

src/battle_script_commands.c

@@ -4942,7 +4942,7 @@ static void Cmd_moveend(void)
             break;
         case MOVEEND_CHOICE_MOVE: // update choice band move
             if (gHitMarker & HITMARKER_OBEYS
-             && HOLD_EFFECT_CHOICE(holdEffectAtk)
+             && (HOLD_EFFECT_CHOICE(holdEffectAtk) || GetBattlerAbility(gBattlerAttacker))
              && gChosenMove != MOVE_STRUGGLE
              && (*choicedMoveAtk == 0 || *choicedMoveAtk == 0xFFFF))
             {

src/battle_util.c

@@ -1776,6 +1776,21 @@ u8 TrySetCantSelectMoveBattleScript(void)
             limitations++;
         }
     }
+    if ((GetBattlerAbility(gActiveBattler) == ABILITY_GORILLA_TACTICS) && *choicedMove != 0 
+              && *choicedMove != 0xFFFF && *choicedMove != move)
+    {
+        gCurrentMove = *choicedMove;
+        gLastUsedItem = gBattleMons[gActiveBattler].item;
+        if (gBattleTypeFlags & BATTLE_TYPE_PALACE)
+        {
+            gProtectStructs[gActiveBattler].palaceUnableToUseMove = 1;
+        }
+        else
+        {
+            gSelectionBattleScripts[gActiveBattler] = BattleScript_SelectingNotAllowedMoveGorillaTactics;
+            limitations++;
+        }
+    }
 
     if (gBattleMons[gActiveBattler].pp[moveId] == 0)
     {
@@ -1831,6 +1846,8 @@ u8 CheckMoveLimitations(u8 battlerId, u8 unusableMoves, u8 check)
             unusableMoves |= gBitTable[i];
         else if (gBattleMons[battlerId].moves[i] == MOVE_STUFF_CHEEKS && ItemId_GetPocket(gBattleMons[gActiveBattler].item) != POCKET_BERRIES)
             unusableMoves |= gBitTable[i];
+        else if (GetBattlerAbility(battlerId) == ABILITY_GORILLA_TACTICS && *choicedMove != 0 && *choicedMove != 0xFFFF && *choicedMove != gBattleMons[battlerId].moves[i])
+            unusableMoves |= gBitTable[i];
     }
     return unusableMoves;
 }
@@ -7837,6 +7854,10 @@ static u32 CalcMoveBasePowerAfterModifiers(u16 move, u8 battlerAtk, u8 battlerDe
         if (moveType == TYPE_DRAGON)
             MulModifier(&modifier, UQ_4_12(1.5));
         break;
+    case ABILITY_GORILLA_TACTICS:
+        if (IS_MOVE_PHYSICAL(move))
+            MulModifier(&modifier, UQ_4_12(1.5));
+        break;
     }
 
     // field abilities