SS Aqua after you have beaten the elite four in the captains room the gentleman gives you it
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you have to trade it when held with a metal coat.
Trade onix while it is holding metal coat
1.Cheating. 2.Trade a Pokemon for Onix that holds Metal Coat.
You'll need to trade for it or trade for a Scyther holding a Metal Coat.
the Pokemon that evolve with metal coat are steelix and scisor