Poison, Fighting, Bug and Ghost.
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Psychic and Ground
psychic type pokemon are weak against psychic steel and dark
A psychic, dark, or steel type Pokémon.
You can beat it easily with Dark, Bug, and Ghost type Pokemon. It is least effective by Psychic, and Fighting.
Bug, Ghost, and Dark type moves are all super effective against Psychic-type Pokemon. As these are considered basic fears of the mind and would be the weakness of a Psychic which fights using its mind.