Gastrodon
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Gastrodon (トリトドン, Toritodon?) is the evolved form of Shellos. Like its pre-evolved form, Gastrodon is a "sea slug Pokémon" that follows allopatric speciation; those found in western Sinnoh are pink and brown, while eastern Gastrodon are blue and green. In Pokémon Diamond and Pearl, the creature is used by Cynthia, the Pokémon League Champion. Gastrodon uses the same two abilities as Shellos. Cynthia's Gastrodon appears with her in DP096 & DP097.
Gastrodon was designed by Ken Sugimori and Satoshi Tajiri. Sugimori also drew conceptual artwork of Gastrodon. It first appeared in Pokémon Diamond and Pearl, published in Japan on September 28, 2006. Junichi Masuda commented in the May 2007 issue of Nintendo Power that "There's also a sea-slug Pokémon that we weren't able to put in Ruby and Sapphire that we were able to put in this one Pokémon Diamond and Pearl ", likely referring to Shellos. Its name is probably based on the animal, Gastrotrich.
GamesRadar stated that Shellos were "downright cute", "but once they’ve evolved...are a different story".
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