there is no level for onix to evolve it will evolve if u trade it to another game make sure it holds a metal coat or it will not evolve
sorry doesn't evolve in leaf green
Onix does not evolve at any lvl. You have to have it hold metal coat and then trade it. Then you will have steelix. Same goes for syther to evolve to sizzor.
it doesn't -_-
Onix does not evolve by level. It can evolve by being traded while holding metal coat.
Geodude level 12 Onix level 14
Level: Onix Evolves By Trading.
level it up
You have to trade him
In Pokemon, Onix does not evolve at a specific level. The only way that Onix can evolve into Steelix is by trading it to someone while it is holding a metal coat.
onix has to be traded and be holding metal coat
Onix doesn't evolve through leveling. But, make him hold a Steel Coat, and he will evolve into a Steelix!