Onix

Onix (イワーク Iwark) is a /-type Pokémon, who evolves into Steelix when traded while holding a Metal Coat.

Appearance
Onix is a Rock Snake Pokémon. Its serpentine body is made up of large boulders and little pebbles. It has a long horn atop its head and small eyes.

Special Abilities
Onix can have the ability Rock Head or the ability Sturdy. Rock Head prevents Onix from recoiling. Sturdy give Onix immunity to OHKO moves. When it is burrowing underground, it can cause rumbles and earthquakes. It can dig up to 50 MPH. It has a compass in its brain that can tell what direction Onix is facing.

Evolution
Onix evolves into Steelix when traded while holding a Metal Coat.

Etymology
Its name comes from "Onyx," a black stone that can be found in jewelery.