Shonosuke hosts the annual Sumo Conference, a tournament that Ash stumbled into after passing through Rikishii Town. The spark came when Ash spotted Raiden training his Feraligatr at a local facility—Shonosuke's obvious passion for the sport was enough to convince Ash to enter the competition.
He took his role seriously throughout the tournament, overseeing matches with a keen eye. When he noticed something off about "Jessiyaki" and her Miltank defeating an Ursaring, Shonosuke wasn't afraid to use his authority to challenge the call. It didn't take long for him to catch on to Team Rocket's scheme—the disguised Wobbuffet gave them away when they relied too heavily on Counter, a move that violated tournament rules. Shonosuke disqualified them on the spot.
With Team Rocket out of the picture, the competition wrapped up smoothly. Ash ended up winning the whole thing, and Shonosuke presented him with the title and prize money.
Content compiled by AnimeList.moe from publicly available sources.
