PsychicDark
Psychic and Dark types: weaknesses, resistances and Pokémon
Psychic and Dark Pokémon take quadruple damage from Bug moves, take double damage from Fairy moves and are immune to Psychic moves.
The balance is even: 2 weaknesses and 1 resistances or immunities.
Psychic moves are super effective against Fighting and Poison and not very effective against Psychic and Steel. Dark moves are super effective against Psychic and Ghost and not very effective against Fighting, Dark and Fairy.
To beat these Pokémon, your best pick is Bug moves. Avoid Psychic moves, which deal little or no damage.
There are 2 Pokémon with this combination, such as Inkay and Malamar.