Cloyster

Cloyster is a dual-type Water/Ice Pokémon known for its hard, spiky shell and its ability to clamp down on opponents with its powerful jaws. It evolves from Shellder when exposed to a Water Stone. Cloyster's shell is extremely tough, providing excellent defense, and it can shoot spikes at its foes. Its inner body is rarely seen, as it remains hidden within its protective shell.