Brock's Steelix

Brock's Steelix タケシのハガネール Takeshi's Haganeil

Brock's Steelix

Debuts in Showdown in Pewter City Caught at Pewter City (given) Evolves in Prior to Grating Spaces Gender Unknown Ability Unknown Current location Pewter Gym

→ This Pokémon spent at least 403 episodes as Onix.

Voice actor Japanese English As Onix Unshō Ishizuka As Steelix Unshō Ishizuka

Brock's Steelix (Japanese: タケシのハガネール Takeshi's Haganeil) was the first Pokémon acquired by Brock in the anime, and is his main battling Pokémon in both the anime and games.

In the anime

As an Onix, battling Ash's Pikachu

Its voice actor in both Japanese and English is 石塚運昇 Unshō Ishizuka.

Brock received it as an Onix as a present from his father, Flint, during his tenth birthday, as seen in a flashback in A Wailord of a Time!.

Like most of Brock's Pokémon, Onix received very little screentime in comparison to the Pokémon of the other main characters. This may have been due to its massive size, although it did have an impressive battle against Vicious's Tyranitar in Celebi: Voice of the Forest. Its size was also used in several ways, such as a staircase in Pokémon Shipwreck. Like most of Brock's pre-Hoenn Pokémon, Onix does not have a distinct personality.

Brock ended up giving Onix and two of his other Pokémon to his eldest sibling, Forrest, who took on the role of Gym Leader at Pewter City. When Brock returned to the gym in Grating Spaces, Onix had evolved into a Steelix under Forrest's care.

Moves used

Using DragonBreath	Move	First used in
	Tackle	Showdown in Pewter City
	Bind	Showdown in Pewter City
	Rock Throw	Showdown in Pewter City
	Dig	Clefairy and the Moon Stone
	Iron Tail	Grating Spaces!
	DragonBreath	Grating Spaces!
Moves used recently are in bold and have been italicized unless all moves all fit this case.
An x shows that the move cannot be legitimately learned by this Pokémon in the games.

In the games

Steelix, in both of its forms, has appeared in every game that Brock has appeared in, and is Brock's main Pokémon in each of those games.

Pokémon Red, Green and Blue

Onix Lv.14	Rock   Ground
Moves
Tackle	Normal
Screech	Normal
Bide	Normal
Bind	Normal

Pokémon Yellow

Onix Lv.12	Rock   Ground
Moves
Tackle	Normal
Screech	Normal
Bide	Normal
Bind	Normal

Pokémon Gold, Silver, and Crystal

Onix ♂ Lv.44	Rock  Ground
	Held item: None
Moves
Bind	Normal
Rock Slide	Rock
Bide	Normal
Sandstorm	Rock

Pokémon FireRed and LeafGreen

Onix ♂ Lv.14	Rock  Ground
	Held item: None
	Ability: Rock Head
Moves
Tackle	Normal
Bind	Normal
Rock Tomb	Rock
--	--

Pokémon HeartGold and SoulSilver

First battle

Onix ♂ Lv.54	Rock  Ground
	Held item: Sitrus Berry
	Ability: Sturdy
Moves
Rock Slide	Rock	Physical
Iron Tail	Steel	Physical
Sandstorm	Rock	Status
Screech	Normal	Status

Second battle

Onix ♂ Lv.61	Rock  Ground
	Held item: Unknown
	Ability: Unknown
Moves
Stealth Rock	Rock	Status
Rock Slide	Rock	Physical
Rock Polish	Rock	Status
Sandstorm	Rock	Status

Pokémon Stadium

Round 1

Onix Lv.50	Rock   Ground
Moves
Bind	Normal
Toxic	Poison
Earthquake	Ground
Rock Slide	Rock

Round 2

Onix Lv.50	Rock   Ground
Moves
Bind	Normal
Rock Slide	Rock
Earthquake	Ground
Screech	Normal

Pokémon Stadium 2

Round 1

Onix ♂ Lv.50	Rock  Ground
	Held item: Quick Claw
Moves
Bide	Normal
Strength	Normal
Rock Throw	Rock
Earthquake	Ground

Round 2

Steelix Lv.50	Steel  Ground
	Held item: Scope Lens
Moves
Fissure	Ground
Return	Normal
Earthquake	Ground
Rock Slide	Rock

In the manga

In the Pokémon Adventures manga

Brock with Onix in Pokémon Adventures.

In Pokémon Adventures, Red challenges Brock's Onix during Onix is On! in a gym battle to gain the Boulder Badge. Red uses Pika to battle, but it is still angry with Red for capturing it. Onix first uses Rock Throw at Pikachu causing massive damage. And later, during the chapter, it uses a combined attack, using its body as a torpedo, it creates its ultimate attack of Skull Bash. Pikachu eventually wins the battle, against Onix, by using a powerful electric attack, sending it to pieces.

In the Electric Tale of Pikachu manga

Since Electric Tale of Pikachu is based on the anime, Onix appeared in it in Ash and Brock's Gym battle in Play Misty For Me. It lost the battle.

In the Pocket Monsters manga

In Pocket Monsters, Brock's Onix appears in Take Out The Rival Onix, in Isamu Akai's battle with Brock.

In the Pokémon Zensho manga

In Pokémon Zensho, Satoshi battles Brock's Onix in Nibi City. Satoshi uses his Charmander in the battle, and tells it to chop the horn-like part of Onix's head off. Onix is then defeated, and Satoshi wins the battle.

In the TCG

Brock's Steelix was featured in the TCG multiple times. The following is a list of cards named Brock's Onix.

Name	Type	Level	Rarity	Set	Set no.
Brock's Onix		30		Gym Heroes	21/132
Brock's Onix		41			69/132

Trivia

Brock receiving Onix on his 10th birthday in the anime

• Steelix is the second Steel-type Pokémon Brock has owned, the first being Forretress.
• Onix took the longest of all Pokémon in the anime to evolve after its introduction, taking at least 403 episodes (in A Real Cleffa-Hanger, Brock went to the Gym), and at most 446 episodes (in Grating Spaces, Brock was surprised to see it) to become a Steelix.
• Steelix is the first Pokémon of Ash's friends to evolve off-screen, others later include May's Glaceon, Venusaur, and Wartortle.

Related articles

For more information on this Pokémon's species, see Onix and Steelix.

This article is part of Project Anime, a Bulbapedia project that covers all aspects of the Pokémon anime.