It’s Halloween month in Pokémon Go, and what better way to celebrate the month of tricks than looking for Ditto? This Pokémon has a unique mechanic that makes it more difficult to find than other species because it never appears in the overworld map.

When you come across certain Pokémon and try to capture them, there’s a low chance it’s a Ditto in disguise. The odds of that Pokémon being a Ditto are fairly slim, and there’s no guarantee you might ever find one in the wild. But knowing which Pokémon to look out for is crucial if you want to try and find one.