Sync battle anim labels with pokeruby

include/constants/battle.h

@@ -281,4 +281,16 @@
 #define MOVE_EFFECT_AFFECTS_USER        0x40
 #define MOVE_EFFECT_CERTAIN             0x80
 
+// Battle terrain defines for gBattleTerrain.
+#define BATTLE_TERRAIN_GRASS        0
+#define BATTLE_TERRAIN_LONG_GRASS   1
+#define BATTLE_TERRAIN_SAND         2
+#define BATTLE_TERRAIN_UNDERWATER   3
+#define BATTLE_TERRAIN_WATER        4
+#define BATTLE_TERRAIN_POND         5
+#define BATTLE_TERRAIN_MOUNTAIN     6
+#define BATTLE_TERRAIN_CAVE         7
+#define BATTLE_TERRAIN_BUILDING     8
+#define BATTLE_TERRAIN_PLAIN        9
+
 #endif // GUARD_CONSTANTS_BATTLE_H