Bakugan Battle Brawlers — S4E4 · Fall From Grace

Shun and Marucho find Dan and Drago training secretly and they discover that the Mechtogan Zenthon originally came from Drago. The next day Sellon and Dan have a match, but Shun and Kris from Sellon's team battle alongside making it a tag-team battle. Drago has a lot of difficulties controlling his powers and almost releases Zenthon, but Shun prevents this from happening by syphoning off Drago's excess power. Dan and Shun manage to pull out a win, but Sellon throws the battle and wins over the audience. Shun confronts her as to why she let them win to which Sellon offers Shun to join her team which he declines.