Steel has a couple weaknesses. Fire, fighting* and ground are the steels biggest weakness.
And then there is the fact that many steel types have a secondary typing such as magneton witch is a dual steel and electric type so ground is 4x effective.
*Keep in mind that all steel types have awesome physical defenses so fighting is only technically strong against steel.
Steel-type Pokemon are weak against Fire, Ground, and Fighting-type attacks.
Fairy type Pokemon are weak to Poison and Steel type Pokemon.
Fairy-type Pokemon are weak against Steel and Poison-type attacks.
You may have to reword that question. But I will answer this question assuming that you mean "What are steel type's weakness in Pokemon?". Fire, fighting, and ground.
Rock type Pokemon are weak against Water, Steel, Grass and Fighting.
Metagross is a Steel/Psychic type, therefore it is weak to...GroundFire
Fairy type Pokemon are weak to Poison and Steel type Pokemon.
Fairy-type Pokemon are weak against Steel and Poison-type attacks.
Electric, fire, steel, rock and poison.
You may have to reword that question. But I will answer this question assuming that you mean "What are steel type's weakness in Pokemon?". Fire, fighting, and ground.
Rock type Pokemon are weak against Water, Steel, Grass and Fighting.
Forretress is a Steel and Bug type pokemon.
Metagross is a Steel/Psychic type, therefore it is weak to...GroundFire
Fire-, rock-, fighting-, and steel-type moves are all super-effective against a pokemon that is only ice-type.
Ice type Pokemon in Pokemon Pearl are weak to fighting type moves, rock type moves steel type moves and fire type moves. This has not changed since the first generation (Pokemon Red and Blue/Green) when the steel type did not exist.
fighting type pokemons weakness are psychic and flying moves steel is weak aageinst water fire fighting and ground
Lucario is a Fighting and Steel-type Pokemon, meaning that Fire, Fighting, and Ground-type attacks are its weaknesses.
The weakness of electric type Pokemon is ground type Pokemon.