Stomping Tantrum

Uses timer in gBattleStruct to count time since last failed move. This is augmented by a MOVE_FAILED result in atk_49 and decreased with an ENDTURN case. EFFECT_STOMPING_TANTRUM doubles  base power if the timer is set.

data/battle_scripts_1.s

@@ -345,6 +345,7 @@ gBattleScriptsForMoveEffects:: @ 82D86A8
 	.4byte BattleScript_EffectPartingShot
 	.4byte BattleScript_EffectSpectralThief
 	.4byte BattleScript_EffectVCreate
+	.4byte BattleScript_EffectStompingTantrum
 	
 BattleScript_EffectVCreate:
 	setmoveeffect MOVE_EFFECT_V_CREATE | MOVE_EFFECT_AFFECTS_USER
@@ -1721,6 +1722,7 @@ BattleScript_EffectPlaceholder:
 	printstring STRINGID_NOTDONEYET
 	goto BattleScript_MoveEnd
 
+BattleScript_EffectStompingTantrum:
 BattleScript_EffectEvasionDownHit:
 BattleScript_EffectVitalThrow:
 BattleScript_EffectFalseSwipe:

include/battle.h

@@ -576,6 +576,7 @@ struct BattleStruct
     u8 introState;
     u8 ateBerry[2]; // array id determined by side, each party pokemon as bit
     u8 stolenStats[NUM_BATTLE_STATS]; // hp byte is used for which stats to raise, other inform about by how many stages
+    u8 lastMoveFailed; // as bits for each battler, for the sake of Stomping Tantrum
 };
 
 #define GET_MOVE_TYPE(move, typeArg)                        \

include/constants/battle_move_effects.h

@@ -333,5 +333,6 @@
 #define EFFECT_PARTING_SHOT 327
 #define EFFECT_SPECTRAL_THIEF 328
 #define EFFECT_V_CREATE 329
+#define EFFECT_STOMPING_TANTRUM 330
 
 #endif  // GUARD_CONSTANTS_BATTLE_MOVE_EFFECTS_H

include/constants/battle_script_commands.h

@@ -162,26 +162,27 @@
 #define ATK48_DONT_CHECK_LOWER      0x8
 
 // atk49, moveend cases
-#define ATK49_SPIKY_SHIELD 0
-#define ATK49_RAGE 1
-#define ATK49_DEFROST 2
-#define ATK49_SYNCHRONIZE_TARGET 3
-#define ATK49_MOVE_END_ABILITIES 4
-#define ATK49_STATUS_IMMUNITY_ABILITIES 5
-#define ATK49_SYNCHRONIZE_ATTACKER 6
-#define ATK49_CHOICE_MOVE 7
-#define ATK49_CHANGED_ITEMS 8
-#define ATK49_ATTACKER_INVISIBLE 9
-#define ATK49_ATTACKER_VISIBLE 10
-#define ATK49_TARGET_VISIBLE 11
-#define ATK49_ITEM_EFFECTS_ALL 12
-#define ATK49_KINGSROCK_SHELLBELL 13
-#define ATK49_SUBSTITUTE 14
-#define ATK49_UPDATE_LAST_MOVES 15
-#define ATK49_MIRROR_MOVE 16
-#define ATK49_NEXT_TARGET 17
-#define ATK49_CLEAR_BITS 18
-#define ATK49_COUNT 19
+#define ATK49_FAILED_MOVE_COUNTER 0
+#define ATK49_SPIKY_SHIELD 1
+#define ATK49_RAGE 2
+#define ATK49_DEFROST 3
+#define ATK49_SYNCHRONIZE_TARGET 4
+#define ATK49_MOVE_END_ABILITIES 5
+#define ATK49_STATUS_IMMUNITY_ABILITIES 6
+#define ATK49_SYNCHRONIZE_ATTACKER 7
+#define ATK49_CHOICE_MOVE 8
+#define ATK49_CHANGED_ITEMS 9
+#define ATK49_ATTACKER_INVISIBLE 10
+#define ATK49_ATTACKER_VISIBLE 11
+#define ATK49_TARGET_VISIBLE 12
+#define ATK49_ITEM_EFFECTS_ALL 13
+#define ATK49_KINGSROCK_SHELLBELL 14
+#define ATK49_SUBSTITUTE 15
+#define ATK49_UPDATE_LAST_MOVES 16
+#define ATK49_MIRROR_MOVE 17
+#define ATK49_NEXT_TARGET 18
+#define ATK49_CLEAR_BITS 19
+#define ATK49_COUNT 20
 
 #define BIT_HP                      0x1
 #define BIT_ATK                     0x2

src/battle_script_commands.c

@@ -4198,6 +4198,13 @@ static void atk49_moveend(void)
     {
         switch (gBattleScripting.atk49_state)
         {
+        case ATK49_FAILED_MOVE_COUNTER:
+            if (gMoveResultFlags & MOVE_RESULT_NO_EFFECT)
+                gBattleStruct->lastMoveFailed |= gBitTable[gBattlerAttacker];
+            else
+                gBattleStruct->lastMoveFailed &= ~(gBitTable[gBattlerAttacker]);
+            gBattleScripting.atk49_state++;
+            break;
         case ATK49_SPIKY_SHIELD:
             if (gProtectStructs[gBattlerTarget].spikyShielded
                 && gBattleMoves[gCurrentMove].flags & FLAG_MAKES_CONTACT

src/battle_util.c

@@ -5149,6 +5149,10 @@ static u32 CalcMoveBasePowerAfterModifiers(u16 move, u8 battlerAtk, u8 battlerDe
         if (WEATHER_HAS_EFFECT && gBattleWeather & (WEATHER_HAIL_ANY | WEATHER_SANDSTORM_ANY | WEATHER_RAIN_ANY))
             MulModifier(&modifier, UQ_4_12(0.5));
         break;
+    case EFFECT_STOMPING_TANTRUM:
+        if (gBattleStruct->lastMoveFailed & gBitTable[battlerAtk])
+            MulModifier(&modifier, UQ_4_12(2.0));
+        break;
     case EFFECT_BULLDOZE:
     case EFFECT_MAGNITUDE:
     case EFFECT_EARTHQUAKE:

src/data/battle_moves.h

@@ -9277,7 +9277,7 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
 
     [MOVE_STOMPING_TANTRUM] =
     {
-        .effect = EFFECT_PLACEHOLDER,
+        .effect = EFFECT_STOMPING_TANTRUM,
         .power = 75,
         .type = TYPE_GROUND,
         .accuracy = 100,