In-universe, how are you supposed to fight Psychic-type Pokémon when then can use telekinesis to control, lift, throw and statis their opponents, dodge shit instantly with Teleport, block attacks with Barrier/Reflect/Light Screen, heal off damage with Recover, and have precognition because of Future Sight? It seems like Psychic is the strongest type by an enormous margin, like practically untouchable and invincible against any type not named Dark, and even then they still have plenty of tricks to deal with Dark-types.