Sync battle anim - dark

include/battle_anim.h

@@ -530,7 +530,7 @@ void AnimTask_InitAttackerFadeFromInvisible(u8 taskId);
 void AnimTask_MoveAttackerMementoShadow(u8 taskId);
 void AnimTask_MoveTargetMementoShadow(u8 taskId);
 void AnimTask_InitMementoShadow(u8 taskId);
-void sub_80B8664(u8 taskId);
+void AnimTask_MementoHandleBg(u8 taskId);
 void AnimTask_MetallicShine(u8 taskId);
 void AnimTask_SetGreyscaleOrOriginalPal(u8 taskId);
 void GetIsDoomDesireHitTurn(u8 taskId);

include/sprite.h

@@ -4,6 +4,7 @@
 #include "global.h"
 
 #define MAX_SPRITES 64
+#define SPRITE_NONE 0xFF
 #define TAG_NONE 0xFFFF
 
 struct SpriteSheet