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Kecleon is a bipedal, reptilian Pokémon that is usually green, but a purplish variant has been seen in the anime and the Pokémon Mystery Dungeon series. Regardless of its main body color, the remaining markings will be the same. On either sides of its head are yellow frills, which are connected by lines to its yellow lips and rings around its eyes. There are small ridges on its shoulders and a red zigzag stripe around its midsection. The hands and feet have three short digits each, and it has yellow soles. It also has a long skinny tail that is usually curled tightly in a spiral.
Kecleon changes the colors of its body for camouflage or to show emotion. However, it is unable to change the color of its red stripe. With the camouflage making it appear almost invisible, it can sneak up on prey and ensnare them with its long pink tongue. It lives in forests.