You can find an Onix in Dark Cave or in Victory Road in the main game.
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
If you mean,, what onix evolves into,, it's steelix,, but the is no Pokemon that evolves into onix
Unfortunately, you can't get an Onix in Pokemon Emerald. To have your own Onix, you need to trade it from FireRed or LeafGreen. Hope I helped :)
You can only get an "onix" in Pokemon sapphire if you have a Pokemon version that has an onix then use a linking cable with other GBA to trade it and then you'll have an onix but "onix's" data can't be stored in your pokedex.NOTE:You can only trade with a Pokemon version that have the same region as your Sapphire has;HOENN REGION.
You can find an Onix in Dark Cave or in Victory Road in the main game.
graveler, rhyhorn, onix, donphan and i think golbat
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
get a bellsprout and trade with a school kid in a house in violet city
You need to give it metal coat and trade to evolve it to Steelix.
Get an onix have it hold the item metal coat then trade it to someone then take it back it will be a steelix now.You catch an onix then trade it while it's holding metal coat.
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
If you mean,, what onix evolves into,, it's steelix,, but the is no Pokemon that evolves into onix
You can battle wildOnix in/at:Union Cave, Mt. Silver, The Cliff Cave, Rock Tunnel, Victory Road, Safari Zone
Unfortunately, you can't get an Onix in Pokemon Emerald. To have your own Onix, you need to trade it from FireRed or LeafGreen. Hope I helped :)
Onix is a Rock/Ground type Pokemon.