Dwebble (Japanese: イシズマイIshizumai) is a new Bug/Rock-typePokémon introduced in Generation V. One is used in-game by Gym Leader Burgh. Dwebble is based on a hermit crab.
The shell for this shellfish Pokémon is a bit different, besides serving as a home it also serves as defense and protection. The Anime also shows that this Pokémon can leave its shell or abandon their old one to make a new and bigger one. Cilan has caught one.