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Pokemon Diamond Pearl and Platinum
Pokemon HeartGold and SoulSilver

What level does Onix evolve at?


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February 07, 2018 5:00AM

Onix does not evolve at any level. If traded while holding a Metal Coat in Pokemon Gold or later, it will evolve into Steelix.

You can't evolve an Onix by leve.l You have to let Onix hold Metal Coat and trade it, then it will evolve into Steelix.