In a promotional trailer for Dragon Ball Heroes, Trunks and the player character face off against an evil Majin Buu. Using Super Saiyan 3, Future Trunks defeats Majin Buu with ease. Super Saiyan 3 ...

While Future Trunks has never been shown using Super Saiyan 3 in canonical media, some alternate versions of him from Super Dragon Ball Heroes have, meaning it should be possible for him to go a ...