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.
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Dragon, Ice and Fairy-type moves.
Fire-type Pokemon are weak against Water, Rock, and Ground-type attacks.
Steel type Pokemon are weak against Fire, Fighting, and Ground type attacks
Steelix is a good Steel type Pokemon. It is also a Ground type, too.
I think the best steel type Pokemon is probably dialga.