Volt

Volt is a character of the day who appeared in That's Just Swellow.

Volt was a competitor in the annual Crossgate PokéRinger tournament. He had a massive ego, due to the fact that in the previous year's competition, he won, despite being a first time competitor. However, Ash was confident in his ability to defeat Volt.

They both faced each other during the first round of the competition. Volt used his Volbeat's Thunder to quickly take care of a Ninjask and Golbat in the competition, but Ash remained calm. Using his Taillow, Ash got the ring and was about to win. Volt used his Volbeat's Thunder again to try to stop Taillow, but Taillow stayed strong and was able to defeat the champion.

(Source: Bulbapedia)