Clauncher is a cyan crustacean Pokémon with two yellow antennae atop its head. It has two claws: one claw forms a single, sharp point, while the other is significantly larger, with two parts, forming a classic pincer. The lower part of this pincer is smaller and yellow. It has black-gray stripes along the end of each abdominal segment and around its claws. It has four small cyan legs that are curved and come to a point. Clauncher has a light-gray underside, three pointed mandibles, round yellow eyes with a small, black pupil, and two small trapezoid tail-parts protruding from its lower abdomen. A horizontal line encompasses the front of its carapace, in line with its eyelids, up until a second vertical line that encompasses its carapace completely. It has light-gray segments on the parts of its legs and claws closest to its body.
Clauncher uses its larger claw to shoot compressed water to jet around, and can be shot like a pistol at flying prey. Up close, the compressed water can shatter rocks. Occasionally, its claws fall off, where it then keeps a low profile until they grow back. Because of its larger claw, Clauncher have a terrible sense of balance, and are unable to swim straight. Its claw meat is also consumed by humans.