[Custom Feature Question] Evolving with Linking Cord while holding an Item

[Celebri]

Hi!

I'm working on a fangame, and I'm trying to remove (or semi-push aside) the need for evolving Pokémon through trading, the same way the Linking Cord did it in Legends Arceus. And while this isn't a problem to do in most cases, since most Pokémon only has one Trade Evolution (like how Poliwhirl becomes Poliwrath with a Water Stone, but if traded while holding a King's Rock, it will become Politoed), I now realize that I've run into a problem for the last few that do have more than one (i.e. Clamperl evolving into either Gorebyss or Huntail while trading while holding specific items)

I have no plans to really include Clamperl, so I could just ignore and make it the one exception.

However, the completionist inside me demands that I do all of them right.


So can I set up an evolution method that would make a Pokémon capable of evolving when using a Linking Cord, but ONLY while also holding a specific item?

Is this possible, and if so, how would I go about that?

 

[Vendily]

So the annoying thing is you can only check one thing at a time with the parameter.
You didn't post your current code. Or what version you're on. I have a v20 sandbox project already set up, so you're getting v20 code.

Here's a new LinkingCord evo type for consistency between the no item and held item variants

GameData::Evolution.register({
  :id            => :LinkingCord,
  :use_item_proc => proc { |pkmn, parameter, item|
    next item == :LINKINGCORD
  }
})
GameData::Evolution.register({
  :id            => :LinkingCordHeldItem,
  :parameter     => :Item,
  :use_item_proc => proc { |pkmn, parameter, item|
    next item == :LINKINGCORD && pkmn.item == parameter
  },
  :after_evolution_proc => proc { |pkmn, new_species, parameter, evo_species|
    next false if evo_species != new_species || !pkmn.hasItem?(parameter)
    pkmn.item = nil   # Item is now consumed
    next true
  }
})