pl. Shellder Bivalve Pokémon
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|Location / range||Routes 6, 11, 19, 20, 21, 17, 18, 26, 27, 41, 205, 47, and 13, Seafoam Islands, Vermilion City, Vermilion Harbor, Cinnabar Island, Olivine City, Pallet Town, New Bark Town, One Island, Five Island, Icefall Cave, Valley Windworks, Fuego Ironworks, Undella Town, Undella Bay|
|Danger rating||Minimal threat|
|Subspecies||Shiny Shellder, Spiral Shellder, Shiny Spiral Shellder, Crown Shellder, Shiny Crown Shellder|
Shellder are small purple clam-like Water-Type Pokémon. They evolve into Cloyster, or can evolve into Crown Shellder or Spiral Shellder if they bite a Slowpoke. They have black round bodies with eyes and tongues, covered by two purple shells.
- Shiny Shellder- Orange shells.
- Spiral Shellder- Grey, spiral-shaped with spikes and fangs. Evolves from a normal Shellder when it bites a Slowpoke's tail.
- Shiny Spiral Shellder- Yellow instead of grey. It's unknown if it was a Shiny Shellder, or it was a normal Shellder which bit a Shiny Slowpoke.
- Crown Shellder- Resembles a Spiral Shellder with all the spikes at the top, except for two large horn-like spikes on it's sides. It also has it's eyes on it's back, and a small red gem on it's front.
- Shiny Crown Shellder- Lighter shade of grey.