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Shellos have two different appearances: West Sea (pink) and East Sea (blue), found on the respective sides of the Sinnoh region. Due to this, there is a myth that the Sinnoh region was once split in two.
Shellos are slug-like Pokémon. Both forms have yellow lining around their eyes, mouth and back.
In the West Sea form, the underside is white, its back is pink in color and has small spike-like protrusions on it. On its head is a ring of pink fleshy knobs arranged like a flower.
In the East Sea form, the underside is green, its back is blue and has two flap-like protrusions. These flaps are lined in yellow. On its head are two white-tipped knobs resembling horns.
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Both Shellos and Gastrodon have a beta back sprite in the game data, however, there are no front sprites for these forms, and neither can be captured in this form.
These beta forms both are similar to the pink West Sea variations of Shellos and Gastrodon, possibly meaning that they were developed from the Generation III versions.
In Diamond and Pearl no in-game trainer uses East Sea Shellos in battle, even if the Trainer's current location is east of Mt. Coronet. This changes in Platinum where all trainers east of Mt. Coronet have the eastern variety.
Shellos' Pokédex color is purple, this is probably due to the fact that pink (the color of the West Sea Shellos) mixed with blue (the color of the East Sea Shellos) would make a shade of light purple.
Its English name appears to be a pun on Shell and the suffix -less, as Shellos does not have a shell. Its Japanese name is a combination of 殻 kara, shell, and 無くした nakushita, to have lost, or 無し nashi, without.
In other languages
German: Schalellos - From schalenlos (without a shell).
French: Sancoki - From sans coquille (without a shell).
Korean: 깝질무 Kkap-Gil-Moo - Includes 껍질 kkapgil (shell).
This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.