Volbeat

“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.”

— Pokémon Ruby

“VOLBEAT’s tail glows like a lightbulb. With other VOLBEAT, it uses its tail to draw geometric shapes in the night sky. This POKéMON loves the sweet aroma given off by ILLUMISE.”

— Pokémon Sapphire

“With their taillights lit, VOLBEAT fly in a swarm, drawing geometric designs in the night sky. They move their nests if their pond water becomes dirty.”

— Pokémon Emerald