Dragon Ball Z: Budokai 2 Cheats

When in Dragon World, whenever you have 2 allies to choose, choose Goten and Kid Trunks. Then when you can equip Goten's skills, equip Mysterious Vest. Have Goku be on the same space as Goten. This will increase Goten's defense by 30%. Then have Goten be on the same space as Kid Trunks. This will increase Goten's defense by another 30%. When you check status, Gotens defense will show up as 160, but because of the Mysterious Vest, it is actually now 200. Then try fighting someone with Goten. Even on Very Hard Mode, Goten cannot lose health when he is hit! This can be used until the end of the stage, or it will reset if you restart Dragon World. Then you will have to re-use the cheat.
If you can only select one ally, choose Goten anyway. Mysterious Vest and meeting with Goku will make his defense 170. This is not enough to block all damage, but it should give you a considerable amount of protection. I recommend equipping Goten with an additional Miracle Power, so his defense will increase as the fight goes on.
Note: This only works in Dragon World. Exitting Dragon World while having a heightened defense will not transfer the defense status. However, skills still apply.
WARNING: If an enemy has a heightened attack status, ex. 120, you will need a defense of 220 to be invincible. This can be achieved through defense icons found on the map. Note that this does not have to be Goten, any character can use this as long as their defense is 100 higher than the enemy's attack.

This works only in training mode. And you can do it anytime. As soon as it starts press <select> and you will make your ki. Push it again to drop it to zero

Press R2 to make Bulma pop out of her corner of the screen