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 this POKéMON'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.
Fire Red
It is said that if an ONIX lives for over 100 years, its composition changes to become diamond-like.
Leaf Green
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.
Heart Gold
Its body has been compressed deep under the ground. As a result, it is even harder than a diamond.
Soul Silver
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.
