You find it in Orbegugh Mnes or on Iron Island
all the Pokemon on route 210 in Pokemon diamond and pearl are ponyta, geodude and if your really lucky you can find onix.
Level: Onix Evolves By Trading.
Trade Onix with the steel coat item to evolve it.
level it up
To evolve onix you must give it a metal coat then trade it and it will evolve
You need to give ONIX a METAL COAT to hold. Then trade him and he will evolve into a STEELIX.
no that is unposable crystal onix is a myth will in all games except one Pokemon cyrestal
give it a metal coat and trade it
When you trade it while it is 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 find an Onix in Dark Cave or in Victory Road in the main game.
graveller, golbat, machoke, medicham, onix, steelix, floatzel