Pokemon Season 10 - Episode 493 – The Champ Twins!

Ash and Dawn (with their Turtwig and Piplup) have a tag team battle with Brian and Ryan (who, with their Quilava and Croconaw, have won 16-straight battles) that gets recorded for reporter Rhonda's "Sinnoh Now" TV program. Ash and Dawn end up fighting each other and they lose the match. They learn about teamwork and win the re-match. With this being the better battle, Rhonda decides to use that battle for her show.