Here's a breakdown:
* Bug: Bug-type moves deal double damage to Psychic-type Pokémon.
* Ghost: Ghost-type moves are super effective against Psychic-type Pokémon, but Psychic-type moves are ineffective against Ghost-type Pokémon.
* Dark: Dark-type moves deal double damage to Psychic-type Pokémon.
Keep in mind that these are just the general rules. Individual Pokémon may have different weaknesses and resistances based on their specific typing and abilities.