Steelix

Steelix is a Steel, Ground-type Pokémon from the Johto-region. It evolves from Onix when fed with 50 candies and Metal Coat is used.

Trivia

 * Like other Pokémon that require an evolution item to evolve into them, Steelix doesn't spawn in the wild nor hatch from eggs and only way to acquire it is by an evolution.