[Error] Alolan Sandshrew appearing where he shouldn't

[Heracross719]

So I've got a snowy route in one section of the game and a regular cave in another. I put Alolan Sandshrew in the snowy route but wanted regular sandshrew in the cave.

I put this in Pokemon Forms
MultipleForms.register(:SANDSHREW,{
"getFormOnCreation" => proc { |pkmn|
maps = [108,123] # Map IDs for Alolan Sandshrew
next 1

However when I go to Map 88, one clearly not defined in the forms script above, the Alolan variant shows up. Any idea how to fix this?

 

[James Davy]

Your code will always return the Alolan variant. To fix it so only Map IDs 108 and 123 will yield the Alolan variant use this code:

MultipleForms.register(:SANDSHREW, {
  "getFormOnCreation" => proc { |pkmn|
    maps = [108,123] # Map IDs for Alolan Sandshrew
    if maps.include?($game_map.map_id)
      next 1
    end
    next 0
  }
})