Fire type moves are good against a pure Steel type. Steelix or Bastiodon, however, have types the negate this, so I suggest Fighting types because this is super effective against both of their types.
Poison and Steel.
Fire, Fighting and Ground.
Fighting, Rock, Fire and Steel
Steel type Pokemon are weak against Fire, Fighting, and Ground type attacks
Bug, Ground, Psychic, and steel
fire fighting and ground beat steal!
fire, steel, rock, fighting.
Fairy is weak to Poison and Steel.
Use a fire type pokemon, fire beats steel.
Steel-type and Dragon-type moves are supper effective on dragon-type Pokemon :)
In Pokemon certain types can beat others and here are my examples: Water beats Fire, Fire beats Grass, Grass beats Water, Dark beats Ghost, Water beats Electric, Water beats Ground, Water beats Rock, Grass beats Rock, Grass beats Ground, Fighting beats Grass, Flying beats Grass, Physic can beat Grass, Ground beats Fire, Fire beats Steel, Fighting beats Dark, Bug beats Dark
Fire/fighting type pokemon are good . such as pokemon in the charmander family