Made Gen6 Exp Share flag easier to understand

include/config/item.h

@@ -18,6 +18,8 @@
 #define I_REUSABLE_TMS          FALSE       // In Gen5-8, TMs are reusable. Setting this to TRUE will make all vanilla TMs reusable, though they can also be cherry-picked by setting their importance to 1.
 
 // Exp. Share config
+// To use this feature, replace the 0 with the flag ID you're assigning it to.
+// Eg: Replace with FLAG_UNUSED_0x264 so you can use that flag to toggle the feature.
 #define I_EXP_SHARE_FLAG        0           // If this flag is set, every Pokémon in the party will gain experience, regardless if they participated in the battle or not.
 #define I_EXP_SHARE_ITEM        GEN_5       // In Gen6+, the Exp. Share was changed from a held item to a Key item that toggles the effect described above.
 

src/battle_util.c

@@ -11189,7 +11189,7 @@ bool32 IsAlly(u32 battlerAtk, u32 battlerDef)
 
 bool32 IsGen6ExpShareEnabled(void)
 {
-#if I_EXP_SHARE_ITEM < GEN_6
+#if I_EXP_SHARE_FLAG <= TEMP_FLAGS_END
     return FALSE;
 #else
     return FlagGet(I_EXP_SHARE_FLAG);