it doesnt.....unless pokemon brings up the next pokemon and shows steelix's evolution
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Steelix
Onix does not evolve by level, it evolves into Steelix by trade whilst holding a metal coat.
Onix evolves into Steelix, while holding a Metal Coat and traded. Steelix can also Mega Evolve, but cannot evolve into any other Pokemon.
If you want to get a Steelix you must give it a item, called a Metal Coat to a Onix, and Then trade it to a friend, and it will evolve to Steelix.
trade it with a steel coat