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Type alone doesn't mean anything. You can have an excellent defensive type like Steel down in the depths of NU (Mawile and its 380 BST says hi) or you can have a supposedly "bad" defensive type like the Kyurem formes in ubers (Smogon admitted Kyu-B's unbanning was a mistake and will likely be tested for ubers after Keldeo). Or they can just be good enough for OU like Mamoswine.