What Pokemon are not affected by psychic?

Answer 1

All Pokémon that are either part or only Dark-type will not be affected by any Psychic-type attacks that do damage (such as Psychic). Psychic attacks that have effects such as stat reduction still affect Dark-types. However, Psychic attacks that damage foes that have a chance of an added stat reduction on top of damage will not affect Dark-types. This means that any possible side effects besides damage will not work.