It doesn't evolve at a level, you need to give it a metal coat then trade it.
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Onix does not evolve by level. It can evolve by being traded while holding metal coat.
Onix does not evolve by level, it evolves into Steelix by trade whilst holding a metal coat.
Level: Onix Evolves By Trading.
onix doesn't evolve by level you have to trade it with a metal coat on it
Onix doesn't evolve through leveling. But, make him hold a Steel Coat, and he will evolve into a Steelix!