trade it with a steel coat
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Steelix
Onix does not evolve by level, it evolves into Steelix by trade whilst holding a metal coat.
Onix doesn't evolve from anything. It evolves into Steelix, but Onix is the base pokemon for that evolution chain. :)
well onix can evolve if you have a metal coat is onix has the metal coat on it if you trade it with a friend and you friend gives it back you will have a steelix.
Onix evolves into Steelix, while holding a Metal Coat and traded. Steelix can also Mega Evolve, but cannot evolve into any other Pokemon.