make it compie hopefully

include/field_specials.h

@@ -19,5 +19,9 @@ u8 GetSSTidalLocation(s8 *mapGroup, s8 *mapNum, s16 *x, s16 *y);
 void sub_813A128(void);
 void sub_813A878(u8 a0);
 u8 sub_813BADC(u8 a0);
+bool8 sub_813B9C0(void);
+void SetShoalItemFlag(u16 v0);
+void UpdateFrontierManiac(u16 a0);
+void UpdateFrontierGambler(u16 a0);
 
 #endif // GUARD_FIELD_SPECIALS_H