Iron Mountain, Snowpoint Temple, and Victory Road
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If a friend already has a steelix then they can trade you one, but no matter what either trade an onix while it holds metal coat or take one from someone else you have to trade.
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
Onix does not evolve by level, it evolves into Steelix by trade whilst holding a metal coat.
in pokemon dp you get a steelix in olg of alpha --- The easiest way is to get an Onix, give it a Metal Coat and trade it, or trade for a Steelix from someone else. Otherwise, Iron Island is your best bet, or Victory Road or Snowpoint Temple
Trade an Onix while holding a metal coat