Baba's Fortune Telling: Baba's Tournament Reward

[Vegeta-Tail]

Goku's weird blue costume with popo's hat, unlocked after a secret training with Popo and Kami
"a Hero's weird suit after a tough training above the clouds"

Piccolo's postboy outfit and Goku normal human clothing after wishing from the blackstar dragon
"the car isn't their strongest point, actually, the clothing is!"

[Kamiccolo33]

OK, so if you want to simply Teen Gotenks, how about this:

To unlock the true power of the two-in-one, the happy-go-lucky children must grow up and find the seven spheres of darkness...

Yep, that's great. 

Majin Buu can learn Kamehameha from Goku
"This enemy of innocence sees and does like a child to learn the most recognizable from the most recognizable in this famous world.