it doesn't evolve by level you have to give it a metal coat to hold and then trade it
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Onyx doesn't evolve by level you trade it holding a steal coat!!!!! ONYX ONYX ONYX
Onix does not evolve by level, it evolves into Steelix by trade whilst holding a metal coat.
AnswerIn Pokemon Platinum, Fire Fang is a base move of Steelix's. This means that if Steelix does not have Fire Fang in its moveset upon capture, you can take it to the Move Tutor in Pastoria City (on any level) and teach it to Steelix again.
Onix doesn't evolve at a level. You have to give it the item 'Steel Coat' and trade it to make it evolve into Steelix. Or just catch a steelix at Victory Road using dusk balls
he evolves with a metal coat when you trade him