The type that is Strong against Steel Is water at least that is one that I know.
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Poison and Steel type moves are good against Fairy type Pokemon.
Fire, Fighting and Ground Type moves are super effective against Steel Types.
Fire Steel Rock Fighting
Fire and ground type Pokémon.
you will need a good level pokemon but your types can be either water,fire or ground. and fight The best pokemon against steel type is fire type pokemon......train your fire type pokemon to high level before you fight with the gym ....