create battle_transition.h

include/battle.h

@@ -927,9 +927,6 @@ u8 GetBankSide(u8 bank);
 u8 GetBankIdentity(u8 bank);
 u8 GetBankByIdentity(u8 bank);
 
-// battle_transition
-void sub_8149DFC(u8 a1);
-
 // Move this somewhere else
 
 #include "sprite.h"

include/battle_transition.h

@@ -0,0 +1,6 @@
+#ifndef GUARD_BATTLE_TRANSITION_H
+#define GUARD_BATTLE_TRANSITION_H
+
+void sub_8149DFC(u8 a1);
+
+#endif // GUARD_BATTLE_TRANSITION_H

src/tileset_anims.c

@@ -3,7 +3,7 @@
 #include "global.h"
 #include "palette.h"
 #include "blend_palette.h"
-#include "battle.h"
+#include "battle_transition.h"
 #include "task.h"
 
 // Static type declarations