Relic Castle Catacombs in the wild. You have a 15% of finding it.
Onix evolves into Steelix when you trade Onix while holding a metal coat.
It can be found in the Relic Castle in Pokemon Black Or White
You need someone to trade a you a Onix that is holding a Metal Coat
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
you have to register alot of people in your pal pad
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 evolve an onix and a syther, both you have to trade and trade back holding the item
Onix is a Rock/Ground type Pokemon.
Onix is in Pewter City where Brock is.
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.
Onix holding a metal coat,Karablast trade with Shelmet will evolve too.Thats all I know.