Dragon Ball Z: Budokai 2

On the first level, where you have to get to the Dragonball before Raditz and Nappa, defeat all the Saibamen that pop up until a red one appears. Fight that one and win. You should get a new capsule for Hercule. Equip the capsule, and whenever Hercule's health drops below one sixth he will now receive a boost of energy. This may require a few attempts

Unlock Mysterious Vest and Super Holy Water. Equip them and something else to Goten. Every time in Dragon World, get Goten as an ally. Have Goten and Goku stand next to each other. Then, try to get an armor thing or two. If you get two worth +20%, you will be almost invincible.

On the "5" place, chose Kid Trunks and Goten as allies. Have Goten and Trunks stand at the same location. They will do the spin power-up and Goten will get +30 defense and trunks will get +30 attack. There are two more +20 armors on the lower area (the area where you start). Pick those up and he will be at 210 defense. Then, equip Goten with Mysterious Vest and he will not be able to be hurt, and you will get all "Perfects", unless you fight on a location that drains your health.

On planet Namek, face Captain Ginyu with Vegeta. Do not fight him while he has the dizzy symbol over his head or you will take two lives and likely kill him. Instead, beat him once and make him challenge you. If done correctly, you will see an FMV sequence where Ginyu asks Vegeta to join the Ginyu Force. Vegeta will reply that he would never do that stupid pose. Also, after you take away one life and fight him again, Vegeta will tell Ginyu that the Ginyu Force has been changed to the Vegeta Special Forces and Captain Ginyu is welcome to join.

On a level where three characters are playable (Goku, Gohan, and Goten), take one of the three and walk onto the same space as another one. They will power up. With the same character, walk onto the same space as the other one. They will power up again. Next, search for defensive power-ups and equip Sturdy Vest. By now, these characters' defense should be at 200 (at least). A normal attack will do half of 1 point damage.

In Dragon World, do not take the Potara Earrings from the Supreme Kai to fuse into Vegito. Complete the game without taking them.

Super Saiyan (one slot)
Double Buster x2 (one slot each)
Potential (two slots)
Mixed Blood Power (one slot)
Ki Control (one slot)

Set the taunt (P + K + G + E) to either of the shoulder buttons. Then, perform the taunt during the battle. Your opponent's Ki will drop one level. This is very useful when preventing your opponent from performing high damage moves or going Super Saiyan.

When you fighting someone, charge your Ki for one second. Then, press Select and you will have maximum Ki. You can do this as long as desired.

The best way to get maximum Ki for Goku and Vegeta is to win their Angel Halos. When you transform into any form of Super Saiyan or Majin Vegeta, your Ki will not decrease. The only way for your Ki to go down is if you use an attack such as Spirit Bomb, Big Bang Attack, or Final Destruction.
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If you press Select in practice mode, your Ki meter will go to the maximum. This will not work in Dragon World, Dueling, World Tournament, or Babidi's Spaceship.
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Android 16's Rocket Punch: Justice League.
Piccolo's Destructive Wave Combo (not the move): Batman Beyond.
Android 20's Photon Wave: Android 19 in the original Budokai.
Frieza's Death Wave: Refers to how people throw a bowling ball.