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Gliscor is a large, mainly blue-purple vampire bat-like Pokémon. Its legs have two toes and a slightly darker circular coloration on the underside, and its tail has two barbs, giving its tail the resemblance of a vampire's fangs. Its arms are red with thin striations, and are completely detached from its black wings, and each are ended with large pincers. Its ears have discernible, red, chambered ear insides, and its eyes are yellow. It has six visible fangs in its mouth, and its waist, like its arms, is red and striated. Gliscor's body resembles an open mouth, with the pointed protrusions coming from its upper torso resembling fangs, further illustrating its vampiric qualities.
As shown in Riding the Winds of Change!, Gliscor, along with its unevolved form Gligar, can emit a sort of sound wave in order to detect obstacles and fly around them, similar to echolocation. Its legs appear to be not suitable for walking, so it can only perform short hops when on the ground. Gliscor hangs upside down while sleeping, much like other bat-like Pokémon, and it is nocturnal. It is capable of soundless flight; however, its wings cannot be flapped to the same extent that other Pokémon's wings can. Like Jumpluff and Wingull, Gliscor uses winds and updrafts to glide from place to place. When there is no wind, Gliscor climbs to the top of tall trees using its sharp raptorial claws and then glides from place to place. This practice is similar to flying squirrels. It is extremely rare, but sometimes it is found in thick pine forests and swamps.