Whirlipede is a purple and black Pokémon with antenna on its face and lower body. In the center is a large yellow eye and around it is some black. It has light purple scales and on these scales are little red circles. Its curled-up body makes it look like a tire.
While it seems to be a counterpart to Swadloon, it evolves through leveling instead of friendship.
Although it's similar to Kakuna and Cascoon in nature, it does not evolve from its previous form nor into its final form quite as fast as them.
Whirlipede looks similar to a wheel.
Whirlipede's appearance is somewhat related to what an ordinary insect will go through at its basic form, which is Venipede, which looks like a centipede, then Whirlipede, which is like Venipede coiling up to begin the stage of development in real life, then evolving to Scolipede, which is the mature centipede.