Document and cleanup pokemon_summary_screen

include/pokemon_summary_screen.h

@@ -4,4 +4,14 @@
 void sub_81C4F98(u8, void(*)(void));
 void ShowSelectMovePokemonSummaryScreen(struct Pokemon *, u8, u8, MainCallback, u16);
 
+// The Pokemon Summary Screen can operate in different modes. Certain features,
+// such as move re-ordering, are available in the different modes.
+enum PokemonSummaryScreenMode
+{
+    PSS_MODE_NORMAL,
+    PSS_MODE_UNK1,
+    PSS_MODE_UNK2,
+    PSS_MODE_SELECT_MOVE,
+};
+
 #endif // GUARD_POKEMON_SUMMARY_SCREEN_H