You can beat it easily with Dark, Bug, and Ghost type Pokemon. It is least effective by Psychic, and Fighting.
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psychic type pokemon are weak against psychic steel and dark
flying & psychic does 2x damage
Fighting Pokemon are good against Ice, Normal, Rock, Dark, and Steel Pokemon.
The pokemon that are strong against psychic are bug, dark, and ghost.
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.