Pokémon R/B: Fix incompatible option combination (ArchipelagoMW#2356)

worlds/pokemon_rb/__init__.py

@@ -463,13 +463,17 @@ def number_of_zones(mon):
         locs = {self.multiworld.get_location("Fossil - Choice A", self.player),
                 self.multiworld.get_location("Fossil - Choice B", self.player)}
 
-        for loc in locs:
+        if not self.multiworld.key_items_only[self.player]:
+            rule = None
             if self.multiworld.fossil_check_item_types[self.player] == "key_items":
-                add_item_rule(loc, lambda i: i.advancement)
+                rule = lambda i: i.advancement
             elif self.multiworld.fossil_check_item_types[self.player] == "unique_items":
-                add_item_rule(loc, lambda i: i.name in item_groups["Unique"])
+                rule = lambda i: i.name in item_groups["Unique"]
             elif self.multiworld.fossil_check_item_types[self.player] == "no_key_items":
-                add_item_rule(loc, lambda i: not i.advancement)
+                rule = lambda i: not i.advancement
+            if rule:
+                for loc in locs:
+                    add_item_rule(loc, rule)
 
         for mon in ([" ".join(self.multiworld.get_location(
                 f"Oak's Lab - Starter {i}", self.player).item.name.split(" ")[1:]) for i in range(1, 4)]