Add POKE_ICON_BASE_PAL_TAG to a header

include/constants/pokemon_icon.h

@@ -0,0 +1,6 @@
+#ifndef GUARD_CONSTANTS_POKEMON_ICON_H
+#define GUARD_CONSTANTS_POKEMON_ICON_H
+
+#define POKE_ICON_BASE_PAL_TAG 56000
+
+#endif  // GUARD_CONSTANTS_POKEMON_ICON_H

src/pokemon_icon.c

@@ -4,8 +4,7 @@
 #include "palette.h"
 #include "pokemon_icon.h"
 #include "sprite.h"
-
-#define POKE_ICON_BASE_PAL_TAG 56000
+#include "constants/pokemon_icon.h"
 
 #define INVALID_ICON_SPECIES SPECIES_OLD_UNOWN_J // Oddly specific, used when an icon should be a ?. Any of the 'old unown' would work
 

src/pokemon_storage_system.c

@@ -40,6 +40,7 @@
 #include "constants/moves.h"
 #include "constants/rgb.h"
 #include "constants/songs.h"
+#include "constants/pokemon_icon.h"
 
 /*
     NOTE: This file is large. Some general groups of functions have
@@ -215,7 +216,7 @@ enum {
 #define BOXID_CANCELED    201
 
 enum {
-    PALTAG_MON_ICON_0 = 56000,
+    PALTAG_MON_ICON_0 = POKE_ICON_BASE_PAL_TAG,
     PALTAG_MON_ICON_1, // Used implicitly in CreateMonIconSprite
     PALTAG_MON_ICON_2, // Used implicitly in CreateMonIconSprite
     PALTAG_3, // Unused