During the ending credits, he was seen participating in the Alamos TownPokémon Contest, where he defeated Maury in the Battle Stage. He was likely defeated by Allegra in the finals, since he was onstage with her when she received the Ribbon.
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Kai's only known Pokémon is an Empoleon which he first used to battle Dawn's Piplup where despite Empoleon being the final evolution of Piplup, found itself unable to keep up with Piplup's Contest moves. It later fell victim to Darkrai's Dark Void and participated in the Alamos Contest where it got Kai to the final only to lose to Allegra and her Infernape.
Kai appears in the manga adaptation of The Rise of Darkrai. Here, he is a veteran Trainer drafted by Baron Alberto to defeat Darkrai. However, despite battling along with Allegra and Maury, the three are no match for the powerful Pokémon.