Add NUM_MON_PIC_FRAMES, and trainer pic size constants

src/battle_anim_utility_funcs.c

@@ -905,7 +905,7 @@ void AnimTask_GetBattleTerrain(u8 taskId)
 
 void AnimTask_AllocBackupPalBuffer(u8 taskId)
 {
-    gMonSpritesGfxPtr->buffer = AllocZeroed(0x2000);
+    gMonSpritesGfxPtr->buffer = AllocZeroed(MON_PIC_SIZE * MAX_MON_PIC_FRAMES);
     DestroyAnimVisualTask(taskId);
 }