Skorupi is a Pokémon which resembles an oversized, pale purple scorpion. Its claws and tail have been swapped, giving it two stingers and a claw tail. The miniature jaws, claws, and tail claws are white. Its arms are attached directly to its head, close to its teal eyes. A pointed marking joins its eyes. The head, arms, two tail segments, and all four legs are light blue, while the body, tail end, and other two tail segments are a darker shade of blue.
It buries itself in sand and lies in wait for unsuspecting prey, gripping it with its tail claws and injecting poison; it will then hold on until the poison takes effect. However, it is capable of surviving for a year without nourishment. Skorupi is related to Sizzlipede through a common ancestor. Skorupi is found in deserts and dry areas like Reversal Mountain, though it can be found in marshy areas such as the Great Marsh. Skorupi is considered a highly dangerous Pokémon due its lethal claws and poison. However, Skorupi cannot stand cold temperatures, becoming weaker when exposed.
Skorupi and Drapion are also the only Generation IV Pokémon in the Water 3Egg Group.
Skorupi is likely based on a scorpion. It has some characteristics that resemble a vinegarroon, a similar arachnid. Its Water 3 Egg Group designation may be a reference to the ancient group of arthropods known as sea scorpions that used to inhabit the oceans and may have been the ancestors of modern scorpions.