Galvantula is a large quadrupedal arachnid-like Pokémon that resembles a tarantula. Unlike normal arachnids, Galvantula only has four legs rather than eight. Its rounded furry body is mainly a vivid yellow color, with a grayish purple underbelly and stripes running along the back of its abdomen. It has deep blue tufts of fur sprouting from its sides. Its four hairy legs are blue and covered with yellow fur. Its has two large round blue eyes with black pupils, and four simple eyes on its forehead.
In its shiny variant, Galvantula retains its yellow coloration. However, this time, Galvantula's hair tufts stripe patterns, and eyes are now dark blue in color.
Galvantula is able to generate electrically-charged threads in order to electrocute and immobilize prey. These threads are released from Galvantula's fangs and can convert into a larger net.