You need to give it metal coat and trade to evolve it to Steelix.
You must Trade Onix while it is holding a Metal Coat in order to Evolve into a Steelix.
onix dose not evolve!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! (quote of above comment) yes it does it evolves into steelix! onix evolves after trade holding metal cover
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
in caves
In order to evolve Onix in Pokemon Crater you must beat Cynthia. After beating Cynthia she will give you the mental coat to evolve Onix.
Onix doesn't evolve from anything. It evolves into Steelix, but Onix is the base pokemon for that evolution chain. :)
Trade Onix with the steel coat item to evolve it.
To evolve onix you must give it a metal coat then trade it and it will evolve
There is no Pokémon that evolves into Onix.
It doesnt
Yes, Onix does evolve into another Pokémon. Onix will evolve into Steelix after being traded while holding a Metal Coat.
Onix does not evolve by level. It can evolve by being traded while holding metal coat.