Yuusuke

Jaco is a Pokémon Breeder and a character of the day who appeared in The Electrike Company.

Jaco was a student at the Pokémon Training Center for Electric-type Pokémon, where he was trying to train an Electrike. They were the only ones that had not yet graduated because Electrike couldn't control its electricity. He met Ash and his friends when his Electrike shocked him while trying to perfect its Thunderbolt.

Jaco actually preferred Flying-type Pokémon over Electric-types and believed his Electrike was doomed for failure. However, Brock didn't believe it and said Electrike was stronger than others. Jaco proved his lack of knowledge after trying to brush Electrike with a metal brush, only to get zapped by the built-up static energy. With the help of Ash, Dawn, Brock, and even James and Meowth, Jaco and Electrike developed a closer friendship, and it was able to use its Thunderbolt perfectly. Later, against what James and Meowth wanted, Jessie attempted to steal Electrike. However, it evolved into Manectric and was able to stop Jessie. Jaco's teacher Cal was impressed by what he and Manectric had done and graduated them on the spot.

(Source: Bulbapedia)