Onix is quite rare, but you can find him/her in the Oreburgh Mine or Mt. Coronet (but if you're willing to take the time to train it, you should go to Oreburgh Mine you'll find one pretty quickly)
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Onyx
If you want a shiny cheat for Pokemon Plantinum, go get an action replay for you and me,download the cheats at"Pokemon Plantinum Shiny cheats for Action Replay" and then download it. That's all I know.I don't know how to download the cheats onto the action replay so don't blame me if I'm wrong!
Rock-types are based on stone. Some are actually made of stone (Onyx, Geodude) or come from stone, ie, are fossil pokemon, like Lileep. Ground pokemon represent burrowers and underground dwellers. Sandslash is one, Onyx is also one.
Onyx and Scyther, my friend. You have to trade them holding the item
you use the metal detector to find onxy