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All you get is an evolution item, like metal coat or dragon scale
trade from firered and on firered you have to evolve scyther (which you can catch in the Safari Zone) by trading it with a metal coat
the Pokemon that evolve with metal coat are steelix and scisor
if you cach an onix there is a posibility that it could be holding a metal coat
You can't make the metal coat, however, you can obtain it as a drop from a boss pokemon.