Shuckle

Shuckle is a very rare Bug, Rock-type Pokémon from Johto region. It does not evolve into nor from any other Pokémon.

Pokédex description
Mold Pokémon

''Shuckle quietly hides itself under rocks, keeping its body concealed inside its hard shell while eating berries it has stored away. The berries mix with its body fluids to become a juice.''

Evolution family
Shuckle is part of a one-member family.

Trivia

 * Shuckle has the highest Defense statistic in the game.