Trade with Metal Coat on it.
You have to trade him
Onix does not evolve by level. It can evolve by being traded while holding metal coat.
onix evolves when u trade it with an item called Metalcoat
It doesn't evolve by level, but rather, by trading it while it's holding a Metal Coat.
There is no such thing as a Crystal Onix in the Pokemon games series. It was only in the Pokemon anime.
You can not obtain a Crystal Onix in the Pokemon games. It is only featured in the TV show Pokemon
Level: Onix Evolves By Trading.
onix has to be traded and be holding metal coat
Geodude level 12 Onix level 14
level 50
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.
level it up