>>45518154Quite simply provide an item that’s associated with Zoroark and Zorua, and that specific item lets you find the species name or dex number you want the illusion pokemon to disguise as. Like, say you put in 196, and while it appears normal to you, it’ll have some sort of mark on its menu sprite to indicate it has been assigned a specific disguise, and it’ll look like it has an Espeon sprite to your opposing trainer.
Otherwise, you could just leave it as it is, and it will work as it is.