Volbeat

Volbeat is an uncommon Bug-type region-exclusive Pokémon from the Hoenn region. It doesn't evolve into nor from any other Pokémon and it is male counterpart of Illumise.

Pokédex description
Firefly Pokémon

''With the arrival of night, Volbeat emits light from its tail. It communicates with others by adjusting the intensity and flashing of its light. This Pokémon is attracted by the sweet aroma of Illumise.''

Evolution family
Volbeat is the part of a single-member family.

Trivia

 * Volbeat was one of the twenty Pokémon released on February 9, 2018.