To evolve onix you must give it a metal coat then trade it and it will evolve
Level: Onix Evolves By Trading.
level it up
You need to give ONIX a METAL COAT to hold. Then trade him and he will evolve into a STEELIX.
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
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
Level: Onix Evolves By Trading.
level it up
You need to give ONIX a METAL COAT to hold. Then trade him and he will evolve into a STEELIX.
When you trade it while it is holding a metal coat.
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
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 evolves into Steelix when it is holding a Metal Coat and traded to someone else.
Onix doesn't evolve from anything. It evolves into Steelix, but Onix is the base pokemon for that evolution chain. :)
You have to make the following Pokemon hold the metal cloak and then trade them: Onix = Steelix Scyther = Scizor
There is no Pokémon that evolves into Onix.