[Error] Alolan Evolutions

[PyroGaleZX]

Hey so I have this Island in my fangame which allows Pikachu, Exeggcute, and Cubone to evolve into their Alolan Forms, however whenever I evolve Pikachu into an Alolan Raichu the game crashes and gives an error

Here's what I currently have:
case evonib
when PBEvolution::Item
case pokemon.species
when 25 # Pikachu -> Alolan Raichu
if $game_map.map_id=[139]
pokemon.form=1
else
pokemon.form=0
end
when 102 # Exeggcute -> Alolan Exeggutor
if $game_map.map_id=[139]
pokemon.form=1
else
pokemon.form=0
end
end
return poke if level==item

 

[HM100]

You may make alternate forms that do not have any difference on a Pokémon but does on another (i.e. Make a pikachu alt Form without changing it. Just set any maps in where form 1 will be set. Then, make form for the evolution of Pikachu, which will be Alolan Raichu. Then evolve Pikachu and you're done.)

This is what I can suggest. In my game, I have done similar method for the case you mentioned. But it happens differently. You need to catch Pikachu on the map where you will find the Alola Forms of some Kanto Pokémon in order to make it Alola Raichu. Moreover, if you use Essentials 16.2 or below, you must be good in Ruby in order to make Alola Pokémon Forms evolve differently (Such as using an Ice Stone to evolve Alolan Sandshrew rather than being in the specific level or higher than it). I have done a workaround for that. If you're using Essentials 17 or above, you can the different evolution method im pokemonforms.txt PBS file assuming it won't evolve into different species.

That's all I can suggest to you for now