Jules works at the Kalos Power Plant near Miare City. He is responsible for making sure that the plant The Kalos Power Plant directly generates solar power from space that is transmitted to earth via micro-waves and stored in the dam of a superconducting ring before being sent to Miare City. His name was confirmed in the Japanese closed captions.
He and his coworkers were tricked by Rocket Gang into letting them into the plant and were subsequently tied up while Rocket Gang began modifying the plants antennae. He was rescued by
Ash Ketchum and his friends and was able to make the electricity flow backward which caused an overload that stopped the radio waves that were affecting the Electric type Pokémon in the area.
After helping stop Rocket Gang, he and his coworkers thanked
Ash Ketchum and friends for their assistance.