Steel and Fairy types: weaknesses, resistances and Pokémon
Steel and Fairy Pokémon take double damage from Fire and Ground moves, resist Bug, Normal, Grass, Ice, Flying, Psychic, Rock, Dark and Fairy moves and are immune to Poison and Dragon moves.
With 11 resistances and immunities against 2 weaknesses, it is a very solid defensive combination.
Steel moves are super effective against Ice, Rock and Fairy and not very effective against Fire, Water, Electric and Steel. Fairy moves are super effective against Fighting, Dragon and Dark and not very effective against Fire, Poison and Steel.
To beat these Pokémon, your best pick is Fire and Ground moves. Avoid Bug, Normal, Grass and Ice moves, which deal little or no damage.
There are 6 Pokémon with this combination, such as Mawile, Klefki, Magearna and Tinkatink.