Not possible.
Pokemon couldn't hold items in that generation.
Many of those items didn't exist, either.
But if you transferred a Magnemite or Magneton to Gold/Silver/Crystal,
It might be holding one.
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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
no!
sorry, you can not buy a metal coat on fire red. trust me, i tried.
You can't make the metal coat, however, you can obtain it as a drop from a boss pokemon.