Probally Mew or Mewtwo
Gothita is a Psychic type pokemon.
Cosmog is a Psychic type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon.
Strong ground and psychic Pokemon such as Claydol, Metagross, and Tyranitar. Both ground and psychic moves are super-effective against poison. They are both multiplied by 2. A good ground type move is earthquake, but since many poison Pokemon have levitate or are flying, they can avoid this. It depends on dual types, abilities, available moves, etc., of both Pokemon, but the strongest Pokemon against poison Pokemon generally would be the strongest psychic and ground Pokemon. Some excellent psychic and ground Pokemon (strongest is quite subjective, so there's no definite answer) are Metagross and Tyranitar, respectively. Claydol is a strong Psychic and Ground dual-type Pokemon.
psychic type pokemon are weak against psychic steel and dark
psychic psychic
The fire type is not super-effective, not very effective or ineffective against the psychic type. Fire type moves deal unmodified damage to psychic type pokemon.
the strongest of its evolutions it is very strong when using psychic attacks. but he is in the top 150 strongest
Pokémon types that can beat Psychic-type Pokémon are Dark, and Bug. Ghosts however lose against Psychic.
Grumpig is a Psychic type pokemon.
Munna is a Psychic type pokemon.
Wynaut is a Psychic type pokemon.
Gothitelle is a Psychic type pokemon.