Congratulations, your Onix is now a formidable Steelix! Renowned Pokémon Trainer Red states, "Onix is a formidable opponent in battle, but it requires careful training and evolution to reach its ...

Onix is a Rock/Ground-type creature that first appeared in Pokemon Red and Blue. In the following generation, Onix gained an evolution, the Steel/Ground-type Steelix, which can be obtained by ...