Vital statistics
Type Rock, Ground
Country {{{country}}}
Gender 50% Male, 50% Female
Weaknesses Fighting, Steel, Ground, Ice, Grass (4x), Water (4x)
Evolves from None
Evolves to Steelix
First Appearance Generation I, 1996
Last Appearance None

Onix is a dual Rock/Ground type Pokemon introduced in Generation I.

It evolves to Steelix when traded holding a Metal Coat.


  • Onix is one of the tallest Pokemon to date, at over 25 feet tall. It's evolution Steelix is also over 25 feet tall, standing 30 feet and 34 feet when Mega Evolved.
  • Onixes appear as a fifth Pokemon on the Steelix Pokémon Shuffle stage, if the player brings their own Onix, then it would be replaced with Pupitar.
  • Onix and it's evolution Steelix were the surprise of the 2016 24 Hours of Daytona, having IndyCar drivers fail to finish in the top two.
  • Despite Onix being a Gigantic Pokemon, only one can be on the team in Pokémon Super Mystery Dungeon.