Black: It is thought its body transformed as a result of iron accumulating internally from swallowing soil.
Gold: Its body has been compressed deep under the ground.As a result, it is even harder than a diamond.
Silver: It is said that if an ONIX lives for over 100 years,its composition changes to become diamond-like.
Crystal: The many small metal particles that cover thisPOKéMON's body reflect bright light well.
Ruby: 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.
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.
Emerald: STEELIX live even further underground than ONIX. This POKéMON is known to dig toward the earth’s core, 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.
Leafgreen: Its body has been compressed deep under the ground. As a result, it is even harder than diamond.
Diamond: Tempered underground under high pressure and heat, its body is harder than any metal.
Pearl: It chews its way through boulders with its sturdy jaws. Its eyes can see in the darkness underground.
Platinum: It is thought its body transformed as a result of iron accumulating internally from swallowing soil.
Heartgold: Its body has been compressed deep under the ground. As a result, it is even harder than a diamond.
Soulsilver: It’s said that if an ONIX lives for 100 years, its composition becomes diamondlike as it evolves into a STEELIX.
White: It is thought its body transformed as a result of iron accumulating internally from swallowing soil.
Black-2: The iron it ingested with the soil it swallowed transformed its body and made it harder than diamonds.
White-2: The iron it ingested with the soil it swallowed transformed its body and made it harder than diamonds.
X: Tempered underground under high pressure and heat, its body is harder than any metal.
Y: It chews its way through boulders with its sturdy jaws. Its eyes can see in the darkness underground.
Omega-Ruby: Steelix lives even further underground than Onix. This Pokémon is known to dig toward the earth’s core. There are records of this Pokémon reaching a depth of over six-tenths of a mile underground.
Alpha-Sapphire: Steelix lives even further underground than Onix. This Pokémon is known to dig toward the earth’s core. There are records of this Pokémon reaching a depth of over six-tenths of a mile underground.
Sword: It is said that if an Onix lives for over 100 years, its composition changes to become diamond-like.
Shield: It is thought its body transformed as a result of iron accumulating internally from swallowing soil.
Legends-Arceus: 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.