Add MON_PIC_SIZE constant

src/battle_anim_throw.c

@@ -2182,7 +2182,7 @@ void AnimTask_SubstituteFadeToInvisible(u8 taskId)
         break;
     case 2:
         spriteId = gBattlerSpriteIds[gBattleAnimAttacker];
-        RequestDma3Fill(0, (void *)OBJ_VRAM0 + gSprites[spriteId].oam.tileNum * TILE_SIZE_4BPP, 0x800, 1);
+        RequestDma3Fill(0, (void *)OBJ_VRAM0 + gSprites[spriteId].oam.tileNum * TILE_SIZE_4BPP, MON_PIC_SIZE, 1);
         ClearBehindSubstituteBit(gBattleAnimAttacker);
         DestroyAnimVisualTask(taskId);
         break;