They flare their frills and generate energy. A single Heliolisk can generate sufficient electricity to power a skyscraper.
– Pokémon X Pokédex
Wow, a single Heliolisk can generate electricity to power a skyscraper. I guess the Pokemon world never has to worry about energy problems.
Heliolisk is part of the only Normal/Electric family. It evolves by stone, but not Thunder stone as one would expect for an Electric type Pokemon, but Sun stone due to its sun-inspired motif.
One of its abilities is Dry Skin, making it good on a water/rain doubles team, especially since it can learn Surf via TM. Pair it up with a Water Absorber, and the two Pokemon can heal each other. Stat-wise it has stats typical of electric types: lots of Speed and Sp Att, decent Sp Def, but bad everything else, especially Defense