[Pokemon R/B] Allow 0 exp setting and add logic rule to Cinnabar Gym to ensure higher level Pokémon are catchable

worlds/pokemon_rb/logic.py

@@ -80,3 +80,8 @@ class PokemonLogic(LogicMixin):
         return (self.can_reach('Mt Moon 1F - Southwest Item', 'Location', player) and
                 self.can_reach('Cinnabar Island - Lab Scientist', 'Location', player) and len(
             [item for item in ["Dome Fossil", "Helix Fossil", "Old Amber"] if self.has(item, player)]) >= count)
+
+    def pokemon_rb_cinnabar_gym(self, player):
+        # ensures higher level Pokémon are obtainable before Cinnabar Gym is in logic
+        return ((not self.multiworld.extra_key_items[player]) or self.has("Mansion Key", player)
+                or self.has("Oak's Parcel", player) or self.pokemon_rb_can_surf(player))

worlds/pokemon_rb/options.py

@@ -199,7 +199,7 @@ class OaksAidRt15(Range):
 class ExpModifier(SpecialRange):
     """Modifier for EXP gained. When specifying a number, exp is multiplied by this amount and divided by 16."""
     display_name = "Exp Modifier"
-    range_start = 1
+    range_start = 0
     range_end = 255
     default = 16
     special_range_names = {

worlds/pokemon_rb/regions.py

@@ -248,7 +248,7 @@ def create_regions(multiworld: MultiWorld, player: int):
     connect(multiworld, player, "Viridian City", "Viridian City North", lambda state: state.has("Oak's Parcel", player) or state.multiworld.old_man[player].value == 2 or state.pokemon_rb_can_cut(player))
     connect(multiworld, player, "Route 3", "Mt Moon 1F", one_way=True)
     connect(multiworld, player, "Route 11", "Route 11 East", lambda state: state.pokemon_rb_can_strength(player))
-    connect(multiworld, player, "Cinnabar Island", "Cinnabar Gym", lambda state: state.has("Secret Key", player), one_way=True)
+    connect(multiworld, player, "Cinnabar Island", "Cinnabar Gym", lambda state: state.has("Secret Key", player) and state.pokemon_rb_cinnabar_gym(player), one_way=True)
     connect(multiworld, player, "Cinnabar Island", "Pokemon Mansion 1F", lambda state: state.has("Mansion Key", player) or not state.multiworld.extra_key_items[player].value, one_way=True)
     connect(multiworld, player, "Seafoam Islands 1F", "Seafoam Islands B1F", one_way=True)
     connect(multiworld, player, "Seafoam Islands B1F", "Seafoam Islands B2F", one_way=True)