Shellder

Shellder is a black pearl-like Pokémon encased within a spiky, blue-violet bivalve shell. It has two round white eyes with tiny black pupils. It has an enormously long red tongue, which it uses to burrow itself into sand and to lure and capture prey. Its body is known to be soft and tender; however, its shell is said to be harder than diamond. Prehistoric Shellder were apparently preyed upon by Omastar. Once ensnared by Omastar's tentacles, its hard shell stood no match to the Spiral Pokémon's deadly powerful bite, and its soft insides quickly devoured.