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I think Rock type should be a counterpart of Steel type. I mean, some resistances and different weaknesses. Currently Steel type and Rock type have a lot of similarities, too many, but Steel type is a lot better.
My idea:
Rock type weak to Grass, Fighting and Steel
Steel type weak to Ground, Fire and Electric
Rock type resists Flying, Normal, Fire, Electric and Poison
Steel type resists Flying, Normal, Bug, Grass, Steel, Dragon, Fairy and Ice. Inmune to Poison