Dark and Steel types: weaknesses, resistances and Pokémon
Dark and Steel Pokémon take quadruple damage from Fighting moves, take double damage from Fire and Ground moves, resist Normal, Grass, Ice, Flying, Rock, Ghost, Dragon, Dark and Steel moves and are immune to Poison and Psychic moves.
With 11 resistances and immunities against 3 weaknesses, it is a very solid defensive combination.
Dark moves are super effective against Psychic and Ghost and not very effective against Fighting, Dark and Fairy. Steel moves are super effective against Ice, Rock and Fairy and not very effective against Fire, Water, Electric and Steel.
To beat these Pokémon, your best pick is Fighting moves. Avoid Normal, Grass, Ice and Flying moves, which deal little or no damage.
There are 3 Pokémon with this combination, such as Pawniard, Bisharp and Kingambit.