Dragon Ball Z: Budokai Tenkaichi

Successfully complete the Novice World Tournament to unlock the Adept Tournament.

Defeat Android 16 with Cell to unlock him.

Fuse two Purple Potaras (Tuffles and Artificial Bruits Waves) to unlock Baby Vegeta.

Fight Majin Buu vs. Kid Buu and let the timer expire to unlock Base Vegito.

In the first Oozaru mission (Saiyan Saga), you are supposed to survive. However, if desired you can actually win. Rush toward it, then press Attack(3), X to stun it momentarily. Repeat this as needed. You will not only survive, but will defeat the Oozaru.

Fight in level in Z Battle Gate at Kami's Lookout. For example, play as Krillin vs. Yamcha. During the fight, go over to the main building and put it between you and the enemy. When you fire your finishing move, you will destroy the building. Go over and look at the rubble. There will be a column stump remaining in the middle, and a Dragonball on top of it. It does roll off -- if it is not on top, then it is somewhere on the ground. Quickly grab it and make sure you defeat your opponent, or you will have to get the Dragonball all over again. All seven Dragonballs will appear one at a time at this location randomly. Just fight in the level seven times to get a wish from Shenron. This is very useful, as every time you get a Dragonball and complete the level, you will also get another Z Item Fusion, which are valuable, and a random Z item. Do this as many times as desired.

In Story mode, select the Buu Saga and look for the level that takes place on top of Kami's lookout (SSJ3 Goten vs. Super Buu). During the fight, destroy the main building on top of Kami's tower. There will be a Dragonball in the rubble every time. Repeat this as many times as desired. Note: You must successfully complete the challenge each time in order to receive the Dragonball at the end of the match (for example, finishing off Super Buu with the Volleyball attack).

Go to the fight with Chiaotzu vs. Guldo. Burst through the few islands in the stage and locate the Dragonball by using your radar. Then, defeat Guldo. He is not much of a challenge. Repeat this to get all the Dragonballs.

Go to the Saiyan Saga and get to the part were you must defeat Krillan with Yamcha or vice versa. Go to the building in the middle of the look out (the biggest one). Destroy it and get the Dragonball there. Defeat the enemy and you will get the Dragonball at the end. Do this seven times (always a different Dragonball) to get all of them.

Go to Sayain Saga and Krillin vs. Yamcha. Blow up the big building and get the Dragon Ball, then win. Repeat this a total of seven times.

When fighting Super Buu in Buu Saga with SSJ3 Gotenks, the Dragon Ball is inside of the lookout house. Get the Dragon Ball and defeat Buu with the super move. Repeat this until you have all seven Dragon Balls. Keep doing this and you will unlock everything that requires a wish to obtain.

To win easily, just press Square then X. You will punch, then deliver a heavy blow leaving your opponent defenseless for a short time. Note: Sometimes very good fighters, for example Android #15 or #12 in Ultimate Battle mode, will break this combo. If your character is fast enough (try increasing the speed stat on your character's Evolution Z to help) and your opponent is a big character that will not be affected by normal punches and kicks or normal Ki blasts, you can land up to one attack from your character's full combo ability (the maximum is about five), then press X. You can get 99 hits if you are skilled enough. It will not count any more after that, but the damage will still be rising.

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.

Dragonballs are found within mountains and islands during Battle Gate fights. You must destroy them by dashing through them or knocking your opponent through it. You must then descend to the ball and "walk" into it; you must also win the fight.