Yes!!watch it it is epic!
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No. There sadly aren't any cheat codes besides the one to unlock everything. (Click on the Dragonball in DragOn Ball Z in the opening; the O representing the dragonball.)
as much as i wish it was, i have no reason to believe that it is. i have not read anything on the internet that suggests that it is real. but if anyone has any intel, this would not be the place to post it, try reddit.
There's a rumor: Akira Toriyama stopped making Dragonball Z because it took too much time away from him and his family.
go back to the dragonball world. do the second stage and DO NOT USE ANY SPECIAL ATTACKS OR SUPPORT CHARACTERS. Beating the stage without using any specials will unlock a secret achievement, which unlocks vegeta. FYI, if you unlock Kaioh-sama later, then level goku and vegetas battle komas all the way up, Vegetto becomes available. Use gamefaqs.com to get a good walkthrough.
Well if you want it to be one of your party Pokemon it should be level 30+ if not any is fine.