how to get a ditto in pokemon let's go?
There are two areas you might find a Ditto. The best place to look for Ditto is in the Pokémon Mansion on Cinnabar Island. Ditto only has a 1% spawn rate in most of the Mansion, but it has a 10% spawn rate in the basement area, where you find the Secret Key that unlocks Cinnabar's Gym.