|Abilities||Rock Head, Sturdy, Weake Armour (Hidden)|
|Episode First Shown in||Showdow in Pewter City|
|First Known Owner||Brock|
|First Game Appeared in|
|National Dex Number||#095|
Onix is the Rock Snake Pokemon. It evolves into Steelix when traded holding a metal coat.
Onix resembles a snake. It's body is made up of 15 rocks, starting off small from its tail, and ending large on it's head. It has a large spike on its forehead, and triangular eyes with a black pupil.
- Brock's Onix appeared in Boulder Bash
- A Team Rocket's Onix appeared in Scott & Zach: Trainers Together
- Bruno's Giant Onix appeared in Charred Courage.
- An Onix appeared on a TV show in A Glimpse To The Past!
- Drake's Onix made its debut in The Orange League Finale! Part 2.
- Brock's Onix appeared in Rockin' Brock.
- Brock's Onix appeared in Vs. Marowak and Vs. Onix.
- Janina's Onix appeared in Vs. Janina and Vs. Steelix.
- Joe catches an Onix in Ditto in Crisis! Rocket Experiment Gone Wrong. It evolves into a Steelix prior to Oops, It's Just Steve Again.
- Bruno's Onix appeared in Vs. Mewtwo 2.
- Grant's Onix appeared in Scaling the Wall.
- Brendan's Onix debuted in Vs. Cubone.
- Brock has an Onix, which first appeared in Rocking Brock.
- Brock has an Onix as shown in Burned !. It is currently a pokemon of Red.
- Mud Sport
- Rock Throw
- Rock Tomb
- Stealth Rock
- Rock Polish
- Smack Down
- Dragon Breath
- Rock Slide
- Sand Tomb
- Iron Tail
- Double Edge
- Stone Edge