.

Also asked, can Onix evolve?

Steelix

Additionally, how does Onix evolve into steelix? In order to evolve your Onix into Steelix, you'll need an item called Metal Coat. Once your Onix is holding the Metal Coat, trading it will trigger the evolution into Steelix. In Omega Ruby and Alpha Sapphire, you can make Steelix evolve into Mega Steelix during battles.

Subsequently, question is, can you evolve Onix without trading?

You can't evolve an Onix by simply training with it while it's holding a Metal Coat, you have to actually trade it between actual GB systems, then trade it back again.

Does Dugtrio evolve into Onix?

Am i the only on that remembers dugtrio evolving into onix? Diglett is a “mole type” Pokémon with a typing of ground, whereas Onix is a “Rock Snake” Pokémon and his dual typing was rock/ground. If that's not enough, Dugtrio is 51 on the Pokédex and Onix is 95.