Appearance
Cloyster is a black mollusk in a light-gray shell wrapped in a jagged blue-violet shell, with horns and a pearl-like face.

#091
Bivalve Pokémon
Cloyster is a Water / Ice-type Pokémon, No. 091 in the National Pokédex, introduced in Generation 1 (Kanto region).
« Once it slams its shell shut, it is impossible to open, even by those with superior strength. »
Cloyster is a black mollusk in a light-gray shell wrapped in a jagged blue-violet shell, with horns and a pearl-like face.
Born from Shellder by a stone, it is rare, nests among rocks and coral, and hunts Slowpoke tails on land. Even shut, it can still fire its spikes.
A wild Cloyster swallowed Jessie's Poké Ball, splashed Team Rocket, then swam off after spitting the Ball out.
Ken Sugimori designed it after a Spondylus bivalve, with a black pearl for a head. Cloyster blends clam, oyster, and cloister, the idea of secluding oneself.