if you cach an onix there is a posibility that it could be holding a metal coat
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sorry, you can not buy a metal coat on fire red. trust me, i tried.
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
Simply trade a scyther from firered while it holds metal coat to emerald you will receive a Scizor.
Scyther evolves to Scizor when you trade Scyther while it is holding a metal coat and when the trade dones Scyther evolves into Scizorgive it a metal coat something like that.
the Pokemon that evolve with metal coat are steelix and scisor