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Steelix is a Steel/Ground-type Pokémon introduced in Generation 2. It is the evolved form of Onix when traded while holding a Metal Coat. Steelix is known as the Iron Snake Pokémon and is renowned for its incredible durability and strength. Its body is made up of rock-like sections coated with steel powder, making it harder than diamonds and able to withstand extreme temperatures. Steelix can burrow deep underground, with records showing it reaching depths of over six-tenths of a mile towards the earth's core.

This Pokémon's evolution is said to be the result of an Onix's composition becoming more diamond-like after living for about 100 years. Steelix's eyes are adapted to see in the darkness underground, and it can easily chew through boulders with its powerful jaws. Interestingly, Steelix is known to sleep in an upright position, maintaining superb balance without toppling over.

Pokédex Data

• Height: 9.2 m (30'02")
• Weight: 400.0 kg (881.8 lbs)
• Abilities: Rock Head, Sturdy, Sheer Force (Hidden Ability)
• Gender Ratio: 50% male, 50% female

Breeding

• Egg Groups: Mineral
• Egg Cycles: 25 (6,169–6,425 steps)

Pokédex Entries Across Versions

• Sword: This Pokémon evolved through use of a strange item. Its body is coated with steel powder and notably hard—not even diamond can leave so much as a scratch.
• Ruby/Sapphire: Steelix lives even further underground than Onix. This Pokémon is known to dig towards the earth's core. There are records of this Pokémon reaching a depth of over six-tenths of a mile underground.
• FireRed: It is said that if an Onix lives for over 100 years, its composition changes to become diamond-like.

Evolutions

Steelix evolves from Onix when traded while holding a Metal Coat. In Pokémon Legends: Arceus, Steelix evolves from Onix when exposed to a Metal Coat.

Habits and Additions Across Generations

Steelix has gained additional forms and abilities across generations. In Generation 6, Steelix received a Mega Evolution form, Mega Steelix, which further increases its defensive capabilities. The Mega Evolution causes the metallic scraps around its neck to react to its movements and change position when attacking. In Generation 8, Steelix gained the ability to Dynamax, allowing it to grow to enormous sizes in battle.