This section temporarily contains information copied directly from Bulbapedia, and needs to be rewritten so not to be classified as plagiarism.
Heliolisk is a yellow lizard-like Pokémon. Heliolisk's tail now has an orange stripe in addition to the black tip. There are also orange bands with a zigzag pattern on Heliolisk's hind legs. Heliolisk's head is completely black except for its yellow lower-jaw. The two frills that this Pokémon had on the sides of its head as a Helioptile are gone, but it has an orange frilled collar in its neck instead.
A single Heliolisk can generate sufficient electricity to power a skyscraper, simply by flaring open their frills. Heliolisk can use this electric energy to stimulates its muscles, boosting the strength in its legs and enabling it to run 100 yards in five seconds.