Best place for this answer would be to go to IGN or Gamefaqs
Chat with our AI personalities
go to the date center and type the passwords...
unlock him stupid!
finish the gt saga in dragon history
I haven't played the game but I have a magizine that tells me disc fusion is a feature for the ps2 that lets you unlock all the characters from every tenkaichi into tenkaichi 3. Please note that the feature is only for ps2, not the Wii.
This how you unlock king cold in dragon ball z budokai tenkaichi , beat cell games in 3 star difficulty.