Steel type Pokemon are strong against the types:
Normal
Grass
Ice
Poison
Flying
Psychic
Rock
Bug
Ghost
Dragon
Dark
Steel
(this won't be exact for Pokemon with 2 types)
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Steel type Pokemon are weak against fire, fighting, and ground types. So if you want to defeat a steel type Pokemon or catch one, make sure you use super-effective moves that are weak against steel type Pokemon.
fire fighting and ground beat steal!
rock bug ghost steel fire or dark
A Fire-type Pokemon can deal 2x the damage to Grass, Ice, Bug, and Steel-type Pokemon.
You need to beat Pryce the second last gym leader. He uses ice Pokemon so bring fire or steel Pokemon.