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[[File:Type Rock/Ground.gif|link=Rock/Ground type]]  
Species Rock Snake Pokémon
Abilities Rock Head
None ← 095 → None
Kanto N/A Johto N/A
Hoenn N/A Sinnoh N/A
Unova N/A Kalos N/A
Evolves From None
Evolves Into [[Steelix]]
(イワーク Iwaaku)
[[Generation I]]
Evolutionary Line
No evolution line
Weight Height
Pokédex Color Egg Group
<font color=Gray>Gray</font>
Shape Footprint

Onix (Japanese: イワーク Iwaaku) is a Rock/Ground-type Pokémon introduced in Generation I that evolves into Steelix when traded while holding a Metal Coat.


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.
Brock Onix

Brock's Onix facing Pikachu at his gym

Special abilities

Onix can have the ability Rock Head or the ability Sturdy. Rock Head prevents Onix from recoiling. Sturdy gives 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.

In the anime

Brock's Onix

Main Article:"Brock's Steelix"

IL005- Showdown in Pewter City 13

Brock's Steelix as an Onix

Brock received Steelix as an Onix from his father, Flint, on his 10th birthday, as seen in a flashback in Having a Wailord of a Time. Onix was Brock's 1st Pokémon and has consistently been his strongest.

Crystal Onix
Main Article:"Crystal Onix"

File:Crystal Onix.png

The Crystal Onix's first and only appearance is in the anime episode The Crystal Onix. Ash and his friends first heard of it through a note they found in a bottle floating in the ocean. The note was written by a little girl named Marissa. She wanted to find the Crystal Onix to help her brother, Mateo, gain inspiration to make glass Pokémon statues. Mateo told a story of how his grandfather discovered the Crystal Onix and then was able to make extraordinary sculptures afterwards. One of those sculptures included the Crystal Onix itself.


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

Game info

Game locations

Onix Locations
Version(s) Location Rarity
Red/Blue Rock Tunnel, Victory Road Common
Yellow Rock Tunnel, Victory Road Uncommon
Gold/Silver Rock Tunnel, Violet City, (trade Bellsprout), Mt. Silver, Victory Road, Union Cave Common
Crystal Rock Tunnel, Violet City, (trade Bellsprout), Mt. Silver, Victory Road, Union Cave Common
Ruby/Sapphire Trade None
Emerald Trade None
FireRed/LeafGreen Victory Road, Rock Tunnel, and Sevault Canyon Common
Diamond/Pearl Iron Island, Snowpoint Temple, Oreburgh Mine, Victory Road, Stark Mountain Common
Platinum Iron Island, Oreburgh Mine, Victory Road, Wayward Cave Common
HeartGold/SoulSilver Violet City (trade Bellsprout), Union Cave, Mt. Silver, Ragged Cliff Gate, Victory Road, Rock Tunnel Common
Black/White Relic Castle Rare

Side game locations

Onix Locations
Game(s) Location
Pokémon Trozei! Phobos Drill, Endless Level 46, Forever Level 23, Mr. Who's Den
Red Rescue Team & Blue Rescue Team Magma Cavern (21F-23F), Magma Cavern Pit (1F-2F), Southern Cavern (40F-50F)
Explorers of Time & Explorers of Darkness Mt. Travail (1F-19F)

Pokédex entries



Its name comes from "Onyx," a black stone that can be found in jewellery or it comes from the end of the word tectonics.


  • Unshō Ishizuka, the actor best known for playing Professor Oak in the original Japanese version of the anime voices both Onix and its evolved form, Steelix in both the Japanese and English-language versions of the anime.


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