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Packing much greater size than a normal Shellder, Shellster has minimal offenses, and instead possesses a very rigid and sturdy shell. It often helps smaller Pokémon by letting them hide within it while it clamps shut.

It swims in the sea by swallowing water, then jetting it out toward the rear. At night, it burrows a hole in the seafloor with its broad tongue to make a place to sleep.