Psychic Pokemon are weak against Ghost, Bug and Dark type attacks, If you are using a Ghost pokemon, be sure to know that Night Shade isn't Super Effective since it always takes the same amount of damage as the level of the Pokemon that uses it.
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Dark Pokemon are Psychic Pokemon's weakness.
Ground and Psychic.
psychic is weak to poison
flying and psychic type
The weaknesses of poison types are psychic and ground.