Dragon Ball Z: Budokai Tenkaichi Tips

Easy World Tournament win
Select a character with high speed dash or a move that works similar to it. At the start of a tournament fight, dash toward the opponent, attack a few times, and knock them back. When they are near the edge of the ring, do high speed dash. As soon as you finish the attack, hit them with Ki blasts. Their feet will instantly touch the ground allowing you to win easily. Additionally, play as Chiaotzu. Rush at your opponent, then do four regular attacks followed by four Ki attacks. If done fast enough, your opponent will just fall off the stage and you will not lose any health.