Shellder

Description
This Pokémon's shell can withstand any attack. However, when it is open, the tender body is exposed. It swims facing backward by opening and closing its two-piece shell. Grains of sand trapped in its shells mix with its body fluids to form beautiful pearls. Clamping on to an opponent reveals its vulnerable parts, so it uses this move only as a last resort. At night, this Pokémon uses its broad tongue to burrow a hole in the seafloor sand and then sleep in it.

Evolution
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Location

 * Cerulean Gym: Boss (Uncatchable)


 * Vermillion City: Wave 9 (needs Super Rod )

Shiny

 * Shiny Shellder has a 0.0125% chance of appearing in the wild.

Shadow

 * Daily Gift (Random Non-evolved Shadow Pokemon)
 * Game Corner (Random Non-evolved Shadow Pokemon): 300,000

Trivia

 * Shellder is the first Pokémon to be able to use Protect on the field.
 * In the initial release of v5.4, there was a bug where the Shellder on Vermillion City was uncatchable when it was supposed to be catchable. It was later fixed.