Add Copycat

asm/macros/battle_script.inc

@@ -1496,6 +1496,11 @@
 	.4byte \ptr
 	.endm
 	
+	.macro trycopycat ptr
+	various BS_ATTACKER, VARIOUS_TRY_COPYCAT
+	.4byte \ptr
+	.endm
+	
 @ helpful macros
 	.macro setstatchanger stat, stages, down
 	setbyte sSTATCHANGER \stat | \stages << 4 | \down << 7

data/battle_scripts_1.s

@@ -316,6 +316,19 @@ gBattleScriptsForMoveEffects:: @ 82D86A8
 	.4byte BattleScript_EffectTechnoBlast
 	.4byte BattleScript_EffectJudgment
 	.4byte BattleScript_EffectAutonomize
+	.4byte BattleScript_EffectCopycat
+
+BattleScript_EffectCopycat:
+	attackcanceler
+	attackstring
+	pause 0x5
+	trycopycat BattleScript_CopycatFail
+	attackanimation
+	waitanimation
+	jumptorandomattack TRUE
+BattleScript_CopycatFail:
+	ppreduce
+	goto BattleScript_ButItFailed
 	
 BattleScript_EffectAutonomize:
 	setstatchanger STAT_SPEED, 2, FALSE

include/battle.h

@@ -827,6 +827,7 @@ extern u16 gLastLandedMoves[MAX_BATTLERS_COUNT];
 extern u16 gLastHitByType[MAX_BATTLERS_COUNT];
 extern u16 gLastResultingMoves[MAX_BATTLERS_COUNT];
 extern u16 gLockedMoves[MAX_BATTLERS_COUNT];
+extern u16 gLastUsedMove;
 extern u8 gLastHitBy[MAX_BATTLERS_COUNT];
 extern u16 gChosenMoveByBattler[MAX_BATTLERS_COUNT];
 extern u16 gMoveResultFlags;

include/constants/battle_move_effects.h

@@ -305,5 +305,6 @@
 #define EFFECT_TECHNO_BLAST 299
 #define EFFECT_JUDGMENT 300
 #define EFFECT_AUTONOMIZE 301
+#define EFFECT_COPYCAT 302
 
 #endif  // GUARD_CONSTANTS_BATTLE_MOVE_EFFECTS_H

include/constants/battle_script_commands.h

@@ -105,6 +105,7 @@
 #define VARIOUS_ARGUMENT_STATUS_EFFECT			53
 #define VARIOUS_TRY_HIT_SWITCH_TARGET			54
 #define VARIOUS_TRY_AUTONOMIZE					55
+#define VARIOUS_TRY_COPYCAT						56
 
 // atk80, dmg manipulation
 #define ATK80_DMG_CHANGE_SIGN                               0

src/battle_main.c

@@ -246,6 +246,7 @@ EWRAM_DATA u16 gLastLandedMoves[MAX_BATTLERS_COUNT] = {0};
 EWRAM_DATA u16 gLastHitByType[MAX_BATTLERS_COUNT] = {0};
 EWRAM_DATA u16 gLastResultingMoves[MAX_BATTLERS_COUNT] = {0};
 EWRAM_DATA u16 gLockedMoves[MAX_BATTLERS_COUNT] = {0};
+EWRAM_DATA u16 gLastUsedMove = 0;
 EWRAM_DATA u8 gLastHitBy[MAX_BATTLERS_COUNT] = {0};
 EWRAM_DATA u16 gChosenMoveByBattler[MAX_BATTLERS_COUNT] = {0};
 EWRAM_DATA u16 gMoveResultFlags = 0;
@@ -3009,6 +3010,7 @@ static void BattleStartClearSetData(void)
         gPalaceSelectionBattleScripts[i] = 0;
     }
 
+    gLastUsedMove = 0;
     gFieldStatuses = 0;
     memset(&gFieldTimers, 0, sizeof(gFieldTimers));
 

src/battle_script_commands.c

@@ -785,9 +785,11 @@ static const u16 sProtectSuccessRates[] = {USHRT_MAX, USHRT_MAX / 2, USHRT_MAX /
 #define MIMIC_FORBIDDEN_END             0xFFFE
 #define METRONOME_FORBIDDEN_END         0xFFFF
 #define ASSIST_FORBIDDEN_END            0xFFFF
+#define COPYCAT_FORBIDDEN_END           0xFFFF
 
 static const u16 sMovesForbiddenToCopy[] =
 {
+     MOVE_TRANSFORM,
      MOVE_METRONOME,
      MOVE_STRUGGLE,
      MOVE_SKETCH,
@@ -807,6 +809,15 @@ static const u16 sMovesForbiddenToCopy[] =
      MOVE_COVET,
      MOVE_TRICK,
      MOVE_FOCUS_PUNCH,
+     MOVE_CIRCLE_THROW,
+     MOVE_DRAGON_TAIL,
+     MOVE_RAGE_POWDER,
+     MOVE_MAT_BLOCK,
+     MOVE_SPIKY_SHIELD,
+     MOVE_SHELL_TRAP,
+     MOVE_SPOTLIGHT,
+     MOVE_FEINT,
+     MOVE_KING_S_SHIELD,
      METRONOME_FORBIDDEN_END
 };
 
@@ -4241,6 +4252,7 @@ static void atk49_moveend(void)
             if (gHitMarker & HITMARKER_ATTACKSTRING_PRINTED)
             {
                 gLastPrintedMoves[gBattlerAttacker] = gChosenMove;
+                gLastUsedMove = gCurrentMove;
             }
             if (!(gAbsentBattlerFlags & gBitTable[gBattlerAttacker])
                 && !(gBattleStruct->field_91 & gBitTable[gBattlerAttacker])
@@ -6746,6 +6758,24 @@ static void atk76_various(void)
             gBattlescriptCurrInstr = T1_READ_PTR(gBattlescriptCurrInstr + 3);
         }
         return;
+    case VARIOUS_TRY_COPYCAT:
+        for (i = 0; sMovesForbiddenToCopy[i] != COPYCAT_FORBIDDEN_END; i++)
+        {
+            if (sMovesForbiddenToCopy[i] == gLastUsedMove)
+                break;
+        }
+        if (gLastUsedMove == 0 || gLastUsedMove == 0xFFFF || sMovesForbiddenToCopy[i] != COPYCAT_FORBIDDEN_END)
+        {
+            gBattlescriptCurrInstr = T1_READ_PTR(gBattlescriptCurrInstr + 3);
+        }
+        else
+        {
+            gRandomMove = gLastUsedMove;
+            gHitMarker &= ~(HITMARKER_ATTACKSTRING_PRINTED);
+            gBattlerTarget = GetMoveTarget(gRandomMove, 0);
+            gBattlescriptCurrInstr += 7;
+        }
+        return;
     }
 
     gBattlescriptCurrInstr += 3;

src/data/battle_moves.h

@@ -4601,7 +4601,7 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
 		.split = SPLIT_STATUS,
 	},
 	{ // MOVE_COPYCAT
-		.effect = EFFECT_PLACEHOLDER, // Needs a custom move effect
+		.effect = EFFECT_COPYCAT,
 		.power = 0,
 		.type = TYPE_NORMAL,
 		.accuracy = 0,