onix doestn't evolve with a stone, you trade it while it is holding a metal coat and it evolves into steelix
Chat with our AI personalities
These Pokemons evolve when the Shiny Stone is used: Togetic, Roselia, Luxio and onix evolve. Togetic evolves into Togekiss, Roselia evolves into Roserade, and onix evolves into steelix. Also, in Pokemon Black you can evolve Minnicino.
Onix doesn't evolve from anything. It evolves into Steelix, but Onix is the base pokemon for that evolution chain. :)
To evolve onix you must give it a metal coat then trade it and it will evolve
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.
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.