It has a different name in DBZ Burst Limit which that song origin came from since this game was the final DBZ game made for the PS2 after the PS3 came out and the first PS3 DBZ game was made DBZ Burst Limit(which was the game with Drama Pieces that was added to its soft and less complicated combo system)
Fat Buu isn’t really complicated as some people say he is pretty easy the two that annoyed me the most was Super Buu when he spins around to avoid a blast or Kid Buu with his crazy combos and consistent blocking
Vegeta sacrifice was in vain the same how Raiden in Mortal Kombat Deception when he sacrificed himself to destroy Onaga but only succeeded in destroying his army not the Dragon King himself
what really happend is that some guys shot hercules and buu was very angry and he made a cloud that shaped like evil buu then they fighted but evil buu had more power and he turded fat buu in to a candy and ate him
I would’ve chose to finish off Fat Buu the same way Vegeta did in the show first damaging him with a few combos and then using the Atomic Blast to damage him further with some of the Final Impact added into the combos and then finish him off with the Final Explosion Ultimate Attack
Gotenks would’ve been a few combos and also a secondary attack but I would’ve stayed as a Super Saiyan to keep it just like the show and not use Super Saiyan 3