Question from Joe1321

How do you evolve Onix?

Because i can't get mine to evolve.

Top Voted Answer

th3l3fty answered:

To evolve Onix into Steelix, you need to trade it while it's holding a Metal Coat. After the trade, it'll evolve, and you'll just need to trade it back.
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ridleyx1290 answered:

You need to get Metal coat which can be found on the ss Aqua in Kanto (Vermillion City). Let Onix hold metal coat then trade it from gameboy to gameboy and back again. You should have a Steelix. There is no other way that I know of that you get a Steelix
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