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.
Shellos and its evolution Gastrodon are examples of allopatric speciation, though the two forms are still able to interbreed (the child takes the mother's form).
Shellos, the Sea Slug Pokémon. Shellos's shape and color varies depending on where it lives. Two different varieties have been confirmed in the Sinnoh region.
|- style="background:#74ACF5"
| colspan="13" | Bold indicates a move that gets STAB Italic indicates a move that gets STAB only from an Evolution of this Pokémon A colored initial indicates that the move is not available to be tutored in this game, while a colored background indicates that the move is available.
|}
|}
When Serebii.net revealed Shellos's English name, the site originally interpreted its name as "Snelios" or "Shelios" due to poor image quality.
Upon Shellos' discovery in the prerelease phase of Diamond and Pearl, fans thought it was a pre-evolution for Lapras; this is due to the fact that the East Sea variation was seen first.
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 may have the eastern variety.
Shellos's Pokédex color is purple, which 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-Jil-Moo - Includes 껍질 kkapjil (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.
