Easy EXP...
To get easy exp., you need to unlock Dragon Arena and have a good person already because then you get stronger people when you use him/her. Find the strongest Uub, Hercul;e or Videl and Battle them. They have no missle attacks(Other then Uub's Ki Cannon) and when they go to hyper mode you just need to keep backing away...then when they run out they are suckers...
(Best do this with a Goku with SS4+10xKamahamaha and maxed out Arts, then it'll do about 2 bars of damage)
You can also trick them into Ultimate moves with this.
If you need more help, we've got more Dragon Ball Z: Budokai 3 cheats and also check out all of the answers for this game
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