Clean up data headers

src/battle_controller_link_opponent.c

@@ -9,7 +9,7 @@
 #include "battle_tower.h"
 #include "battle_tv.h"
 #include "bg.h"
-#include "data2.h"
+#include "data.h"
 #include "link.h"
 #include "main.h"
 #include "m4a.h"
@@ -31,8 +31,6 @@
 
 extern struct MusicPlayerInfo gMPlayInfo_BGM;
 
-extern const struct CompressedSpritePalette gTrainerFrontPicPaletteTable[];
-
 // this file's functions
 static void LinkOpponentHandleGetMonData(void);
 static void LinkOpponentHandleGetRawMonData(void);