From Bulbapedia, the community-driven Pokémon encyclopedia.

Onix (Japanese: イワーク Iwark) is a dual-type Rock/Ground Pokémon introduced in Generation I.

It evolves into Steelix when traded holding a Metal Coat.

Biology

Onix is composed of a giant chain of gray boulders that become smaller towards the tail. Its length makes it the tallest Rock-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, guiding Onix wherever they need to go and prevents them from getting lost while digging.

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. It is said that an Onix that lives for about 100 years will evolve into a Steelix after its composition becomes more diamond-like. It can be found in mountains and caves.

In the anime

In the main series

Major appearances

Starting in Showdown in Pewter City, Brock used an Onix in his journeys in Kanto and Johto before giving it to his little brother, Forrest, for him to train in A Family That Battles Together Stays Together!. At some point before Grating Spaces, it evolved into a Steelix.

In To Master the Onixpected, Ash and his friends encountered a giant Onix. It was on a rampage until Bruno managed to pull a Sandslash out from two of its boulders. Bruno captured the Onix afterwards.

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.

Other

In Pokémon - I Choose You!, an Onix was the next Pokémon a Trainer chose after the opponent's Gengar put their Nidorino to sleep.

In Hello, Pummelo!, Drake used an Onix in the second round in the Orange League championship match against Ash. It battled Squirtle and was defeated.

In Tunnel Vision, multiple Onix were living in Onix Tunnel. They 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.

In Fight for the Light, Janina coated her Onix 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.

In Shapes of Things to Come, Roark used an Onix during his Gym battle against Paul. It went up against his Elekid before being defeated by Chimchar. In A Gruff Act to Follow!, it battled Ash and defeated his Turtwig and Pikachu. In O'er the Rampardos we Watched!, during Ash's rematch with Roark, Pikachu was able to defeat Onix.

In A Maze-ing Race!, an Onix rampaged around until it was forced to retreat.

In Expedition to Onix Island!, multiple Onix, including a Shiny one, lived on a deserted island. Ash and his friends went there to see the Shiny Onix.

In Breaking Titles at the Chateau!, Grant used an Onix at the Battle Chateau in a battle against Viola's Surskit, which Onix won. In Climbing the Walls!, Onix battled Froakie during a Gym battle against Ash and was defeated.

In Caring for a Mystery!, an Onix battled a wild Riolu after it accidentally climbed up on it. Ash later showed up with his Pikachu and helped saved Riolu from Onix. After that, Ash and Riolu battled Onix until it fled.

Minor appearances

An Onix appeared in a fantasy in Dig Those Diglett!.

In Mewtwo Strikes Back and Mewtwo Strikes Back—Evolution, a Trainer's Alakazam was defeated by Mewtwo while it was serving Giovanni.

In Showdown at the Po-ké Corral, multiple Onix were living at Professor Oak's Laboratory.

In The Joy of Pokémon, a Trainer's Onix was treated by the Nurse Joy of an unnamed island.

In Meowth Rules!, the Golden Island villagers had an Onix.

In The Power of One, multiple Onix sensed the disturbance caused by Lawrence III.

An Onix appeared in a fantasy in The Rivalry Revival.

In The Fortune Hunters, an Onix was depicted in the Fortune Teller book.

An Onix appeared in a fantasy in Type Casting.

In Beauty and the Breeder, a Pokémon Breeder's Onix participated in a Pokémon breeding competition.

Two Onix appeared in Celebi: The Voice of the Forest. One was under the ownership of a Trainer, while the other appeared during the movie's intro, which was reused for Pokémon Heroes: Latios & Latias.

In a flashback in Throwing in the Noctowl, an Onix was defeated by Wings Alexander's then-Hoothoot.

An Onix appeared in the opening sequence of Destiny Deoxys.

In Lucario and the Mystery of Mew, multiple Onix were part of the feuding armies that were eventually placated by Sir Aaron in the past.

In All That Glitters is Not Golden!, an Onix evolved into a Steelix in a fantasy.

An Onix appeared in Pokémon Mystery Dungeon: Explorers of Sky - Beyond Time & Darkness.

In One Team, Two Team, Red Team, Blue Team!, Brock used an Onix provided by the Pokémon Summer Academy for the first leg of the Pokémon Triathlon.

An Onix appeared in Steeling Peace of Mind!.

An Onix appeared in Promoting Healthy Tangrowth!.

In A Rivalry to Gible On!, an Onix lived on Mt. Shady.

In Bucking the Treasure Trend!, an Onix attacked Team Rocket.

An Onix appeared in the opening sequence of Zoroark: Master of Illusions.

An Onix appeared in A Pokévision of Things to Come!.

An Onix appeared in Summer of Discovery! on a Pokévision video icon.

An Onix appeared in Volcanion and the Mechanical Marvel.

An Onix appeared in I Choose You!.

In Alola, Kanto!, an Onix chased Ash, Brock, Sophocles, and Kiawe at Professor Oak's Laboratory after being disturbed by Kiawe's Marowak.

In Raid Battle in The Ruins!, a Shiny Onix was part of Shane Seeker's Shiny Pokémon collection, as shown in his Pokédex.

An Onix appeared in a fantasy in A Chilling Curse!. However, this fantasy was removed in the dub, as it was used as part of an untranslatable Japanese wordplay.

Pokédex entries

Episode Pokémon Source Entry DP015 Onix Dawn's Pokédex Onix, the Rock Snake Pokémon. It tunnels through the ground which shakes when it raises its thunderous roar. It can move the ground at 50 miles per hour.

Episode Pokémon Source Entry BW087 Onix Ash's Pokédex Onix, the Rock Snake Pokémon. By twisting its large and powerful body, Onix can quickly bore through the ground at 50 miles per hour.

Episode Pokémon Source Entry XY020 Onix Serena's Pokédex Onix, the Rock Snake Pokémon. Onix takes an enormous amount of soil to its mouth, creating long tunnels.

In Pokémon Origins

In File 1: Red, Red challenged Brock's Onix after defeating his Geodude. It took out most of Red's team but lost to his Charmander.

In File 4: Charizard, Red challenged another Onix belonging to Bruno. He battled it with Scyther and won.

In the Pokémon Masters Animated Trailer

In the Pokémon Masters Animated Trailer, Brock's Onix accompanied him, Scottie, and Rosa on a journey across Pasio.



In the manga

In the Ash & Pikachu manga

Brock has an Onix in Ash & Pikachu.

In The Electric Tale of Pikachu manga

Brock has an Onix in The Electric Tale of Pikachu.

In the Magical Pokémon Journey manga

An Onix appeared in Adventuring the Stone.

In the Pocket Monsters manga

An Onix appeared in JNM08.

In the Pocket Monsters Diamond & Pearl manga

An Onix appeared in PDP12.

In the Pocket Monsters HeartGold & SoulSilver Go! Go! Pokéathlon manga

Takashi owns an Onix in Pocket Monsters HeartGold & SoulSilver Go! Go! Pokéathlon.

In the Pocket Monsters HGSS Jō's Big Adventure manga

Brock's Onix only appeared as a silhouette in JBA5 along with its Trainer and the other Kanto Gym Leaders.

In the Pocket Monsters Platinum: Aim to Be Battle King!! manga

An Onix appeared in PBK1.

An Onix appeared in PBK2.

In the Pokémon Adventures manga

Onix debuted in Onix is On! as Brock's main Pokémon, but a picture of it was shown on a leaflet in Wanted: Pikachu!. Onix later continued to make appearances with Brock in various volumes onward.

An Onix appeared as a silhouette when Green talks about Mew in The Jynx Jinx.

Bruno battled a wild Onix in Ponyta Tale with his Hitmonlee.

Bruno owns an Onix, which first appeared in Punching Poliwrath. He battled Bill, Lt. Surge, and Red with it on Cerise Island. Onix later managed to carry Bruno and Koga off the collapsing island.

An Onix appeared in Can You Diglett? in a fantasy when Agatha and Lorelei explained to Red about how Pokémon and people cannot coexist with each other.

A wild Onix was seen on Cerise Island in Make Way for Magikarp.

An Onix appeared in The Last Battle XIII as one of the Pokémon sent to participate in the fight in Ilex Forest.

Roark has an Onix, which he used during Platinum's Gym battle in A Conk on Cranidos's Cranium.

A Trainer's Onix appeared in Clobbering Claydol.

An Onix appeared in Weavile Wobbles But It Won't Fall Down, under the ownership of a Hiker at the Safari Zone.

A wild Onix appeared in the Wild Area in PASS04.

Pokédex entries

Manga Chapter Entry Pokémon Adventures PS067 Digs through the earth at up to 50 miles/hour in search of food. The tunnels left behind become a favorite habitat of Diglett.

In the Pokémon Diamond and Pearl Adventure! manga

An Onix appeared in In Search of the Legendary Pokémon Dialga!!, where it started rampaging and had to be battled by Hareta's Piplup and Mitsumi's Starly. Onix reappeared in a flashback in Hareta's Very First Pokémon Battle!!.

Hareta caught an Onix on Iron Island in Serious Training on Iron Island!!.

Byron has an Onix, which was used as an obstacle in a challenge in Challenge! The Fortress Of Steel!!.

An Onix was one of the Pokémon Charon conditioned into a fighting machine in Charon Must Be Stopped!.

In the Pokémon Gotta Catch 'Em All manga

An Onix appeared in The Challenge at Celadon University!.

An Onix appeared in GDZ46, under the ownership of Shu's mother.

An Onix appeared in GDZ51.

In the Pokémon Pocket Monsters manga

Brock owns an Onix, which debuted in Bring Down the Powerful Opponent Onix!!.

An Onix appeared in The Legendary Pokémon Appears!!.

An Onix appeared in Aim to be the No. 1 Pokémon!.

An Onix appeared in Good Luck at the Big Pokémon Athletic Meet!.

An Onix appeared in Fierce Competition at the Pokémon Baseball Tournament!, where it was one of the Pokémon that took part in a baseball match.

Giovanni sent out his Onix to prevent Red from interfering with his plans on creating Mewtwo in Bring Down the Strongest Pokémon!!. It reappeared in Good-Bye, Pikachu?!.

An Onix appeared in Curry Showdown! Which is the Most Delicious? as one of the participants of a curry cooking competition.

An Onix appeared in Seize the Dream of One Million Yen!!.

Green's Onix first appeared in Red VS Green?!.

Bruno owns two Onix, both of whom debuted in Clefairy's Under Training!!.

An Onix appeared in I Want to Become Popular!!, under the ownership of a boy.

Professor Oak owns an Onix, which debuted in Save the Pokémon Zoo!!.

In the Pokémon Zensho manga

An Onix appeared in PZ02, under the ownership of Brock.

In the TCG

Other appearances

Onix can be summoned via 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.

Game data

Pokédex entries

Game locations

In side games

In events

Held items

Stats

Base stats

Pokéathlon stats

Type effectiveness

Learnset

Generation VIII Other generations: II - III - IV - V - VI - VII Game Move Type Cat. Pwr. Acc. PP Sw Sh IoA Meteor Beam Rock Special 120 90% 10 Sw Sh IoA Scorching Sands Ground Special 70 100% 10 Bold indicates a move that gets STAB when used by Onix

indicates a move that gets when used by Onix Italic indicates a move that gets STAB only when used by an evolution of Onix

indicates a move that gets STAB only when used by an evolution of Onix Click on the generation numbers at the top to see Move Tutor moves from other generations

Side game data

Evolution

Sprites

Trivia

Origin

Onix's design may be a visual pun on a rock python or an earthworm.

Name origin

Onix is a corruption of onyx (a mineral).

Iwark may be a combination of 岩 iwa (rock) and スネーク snake.

In other languages

Language Title Meaning Japanese イワーク Iwark From 岩 iwa and スネ−ク French Onix Same as English name Spanish Onix Same as English name German Onix Same as English name Italian Onix Same as English name Korean 롱스톤 Rongston From the English words long stone Cantonese Chinese 大岩蛇 Daaihngàahmsèh Literally "Big boulder snake" Mandarin Chinese 大岩蛇 Dàyánshé Literally "Big boulder snake" More languages Hebrew אוניקס Oniks Transcription of English name Hindi ऑनिक्स Onix Transcription of English name Russian Оникс Oniks Transcription of English name Thai อิวาร์ค Iwark Transcription of trademarked Japanese name





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