NormalDark
Normal and Dark types: weaknesses, resistances and Pokémon
Normal and Dark Pokémon take quadruple damage from Fighting moves, take double damage from Bug and Fairy moves, resist Dark moves and are immune to Psychic and Ghost moves.
The balance is even: 3 weaknesses and 3 resistances or immunities.
Normal moves are super effective against no type and not very effective against Rock 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 Fighting moves. Avoid Dark, Psychic and Ghost moves, which deal little or no damage.
There is 1 Pokémon with this combination, such as Obstagoon.