{{Availability/Entry2|v=MD Red|v2=MD Blue|link=Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team|area=[[Magma Cavern]] (21F-23F, Magma Cavern Pit 1F-2F), [[Southern Cavern]] (40F-50F)}}
{{Availability/Entry2|v=MD Red|v2=MD Blue|link=Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team|area=[[Magma Cavern]] (B21F-B23F, Magma Cavern Pit B1F), [[Southern Cavern]] (B40F-B50F)}}
Onix is a Pokémon composed of a giant chain of gray boulders that become smaller towards the tail. Its length makes it the tallestRock-type Pokémon. It has black eyes and a rounded snout. On top of its head is a rocky spine. As it grows older, it becomes more rounded and smoother, eventually becoming similar to black diamonds. Inside its brain is a magnet that serves as an internal compass.
Onix tunnels under the ground at over 50 miles (80 kilometers) per hour, which causes tremors and a terrifying roar that echoes a long way. Hard objects encountered while tunneling are absorbed into its body, which makes it very sturdy. It also consumes the boulders for food. The massive, winding tunnels it leaves behind are used as homes by Diglett. As seen in the Pokémon Stadium series, Onix is capable of rotating its head, or any part of its body, in a full 360 degrees. It is a very aggressive Pokémon that will constantly attack humans and other Pokémon when in pain, as seen in the anime. Onix can be found in mountains and caves.
The Crystal Onix featured a special Onix whose body is made out of glass crystal. Ash and his friends helped a glass sculptor named Mateo search for it because Mateo believed it would help inspire him to be better at his craft.
An Onix appeared in Hello, Pummelo!, under the ownership of Drake. He used it in the second round in the Orange League championship match against Ash; it battled Squirtle and was defeated.
Multiple Onix appeared in Tunnel Vision, where they resided in the Onix Tunnel and attacked anyone who attempted to pass through it. They were temporarily put to sleep by Jigglypuff's singing, but were eventually awakened by Team Rocket.
An Onix appeared in Fight for the Light, under the ownership of Janina, Jasmine's apprentice. Her Onix was heavily coated in wax for protection against Water attacks.
An Onix, dubbed "King Onix", appeared in Hooked on Onix. Team Rocket tricked King Onix into thinking Ash and his friends were going to destroy his kingdom. When Ash managed to convince King Onix that he and his friends weren't bad by defeating it in a battle, Team Rocket tried to steal the royal Rock Snake Pokémon, but their plan was foiled, as usual.
A rampaging Onix appeared in A Maze-ing Race!, where it played a major role.
Multiple wild Onix appeared in Expedition to Onix Island!, with one of them being Shiny. They were residents of a deserted island, and Ash and his friends wanted to see the Shiny Onix.
Onix, the Rock Snake Pokémon. It tunnels through the ground which shakes when it raises its thunderous roar. It can move the ground at fifty miles per hour.
Onix debuts in Onix is On! as Brock's main Pokémon, but a picture of it is shown on a leaflet in Wanted: Pikachu!. Onix later continues to make appearances with Brock in various volumes onward.
Onix is obtainable in a Poké Ball. Once thrown, it flies up into the sky and uses Rock Throw on the player's opponents. This will hit everyone on the field except Kirby if he uses his down special move.
Onix is the second Poké Float to appear. It provides a horizontally flat area all the time it is on-screen, though it becomes diagonal as it leaves the screen.
Onix has a magnet in its brain. It acts as a compass so that this Pokémon does not lose direction while it is tunneling. As it grows older, its body becomes increasingly rounder and smoother.
There is a magnet in its brain that prevents an Onix from losing direction while tunneling. As it grows older, its body becomes steadily rounder and smoother.
Onix has a magnet in its brain. It acts as a compass so that this Pokémon does not lose direction while it is tunneling. As it grows older, its body becomes increasingly rounder and smoother.
Onix is the only unevolved Pokémon that is used in the Pokémon World Tournament by Trainers beyond the right attendant, being used in all of Brock's teams.
Onix has the highest Defense of all unevolved Pokémon.
Onix is the largest unevolved Pokémon.
Origin
Onix is most likely based on a combination of a snake and earthworm. It may also been based on the wyrm, a type of dragon that has been presented as limbless and burrowing.
This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.
Hard Stone (5%)
For other sprites and images, please see Onix images on the Bulbagarden Archives.
