Whirlpool Cup Winner

The Whirl Cup winner is a character of the day who appeared in The Perfect Match!.

He battled Trinity in the final stages of the Whirl Cup. However, just before the battle began, Team Rocket broke into the competition with the intent of stealing the Sea Spirit. He, Trinity, Ash, and Misty defeated Team Rocket, and he continued with the battle.

Although the battle was not shown, he appeared later receiving a Mystic Water for winning the competition.

(Source: Bulbapedia)