Dragon Ball Z: Budokai 2 Cheats

Android 16:Beat Android 16 with Goku.
Android 17: Beat Android 17 with Piccolo.
Android 18: Beat Android 18 with Krillen.
Android 20: Beat Android 20 with Goku.
Cell: Beat Cell with Goku.
Dabura: Get a certain amount of Kili on Babidi's Spaceship (I forget how much).
Majin, Super, and Kid buu: Also get a certain amount of kili on Babidi's Spaceship (I don't remember this either but it is higher than Dabura's).
Frieza: Beat Frieza with Goku
Future Trunks: Beat Vegeta on Namek with Kid Trunks.
Ginyu: Beat Ginyu on Namek with Vegeta.
Hercule: Beat Fat Buu with Great Saiyaman on stage 6.
Kabitoshin: Get 7 dragonballs and wish for the capsule from the Dragon.
Nappa: Beat Nappa with Vegeta
Raditz: Beat Raditz with Goku.
Recoome: Beat Recoome with Goku.
Saiyaman: Beat Cell with Gohan - adult only.
Supreme Kai: Beat Supreme Kai with Goku.
Teen Gohan: Beat the last Cell on Supreme Kai's planet with Adult Gohan.
Tiencha: Get both breakthroughs of Tien and Yamcha
Vegeta: Beat Vegeta with Goku on Namek.
Vegeto: Wish for it on the Dragonballs
Videl: Beat Super Buu as Hercule Stage 8
Yamcha: Beat Nappa with Tien

To unlock the buus you must first complete the game with all dragon
balls in possession at the end of the game and shenron will appear and
you can choose a capsule called babidi's spaceship. With it on the main
menu you can select it. Once in it you must choose a stage 1-4. 1 will
be continuous fighting. 2 will be how long you can stay alive for. 3
will be how many hits you can land before you die. 4 is the best because
you must deflect back and forth a ki blast as many times as you can.
Doing well in these will earn a new kind of currency called killis. The
more you get then the more things you will unlock. You will get Dabura
at around 1000. Fat buu at around 2000. Super buu at arond 2500 and kid
buu at around 3600 and you will unlock moves for them in between. In the
World tournament it is really easy with kid buu and this is an easy way
to earn money.

100 kili - Dabura

320 kili - Hell Blitz

430 kili - Evil Tornado

540 Kili - Demonic Will

800 kili - Yakon ( not a character by the way )

965 kili - Demon Realm Guard

1200 kili - Majin Buu

1420 kili - Innocence Cannon

1530 kili - Hell Blow Shoot

1695 kili - Babidi's Scope

1805 kili - Merry Swing

2025 kili - Mage Guard

2190 kili - Enjoy Browning

2400 kili - Super Buu

2620 kili - III Flash ( Yes that is the name of the capsule )

2730 kili - Hate Ray Cannon

2840 kili- Innocence Dance

2950 kili - Badness Throw

3000 kili - Super Saiyan ( Goku )

3060 kili - Hate Dancing

3170 kili - Vice Browning

3390 kili - Vice Break

3600 kili - Hell Blade Rush

4040 kili - Hell blade Rush

4260 kili - Evil Blast

4480 kili - Majin Buu's Restoration

4700 kili - Vanishing Ball

4975 kili - Loyalty to Babidi

5085 kili - Vanishing Drop

5360 kili - Babidi's Guard

5580 kili - Assault Rain

5745 kili - Innocence Strike

6185 kili - Angry Explosion

6405 kili - Kamehameha

6790 kili - Dabura Cookie

6955 kili - Crazy Smash

7175 kili = Human Candy

7505 kili - Toxic Chocolate

7670 kili - Mad Kill Spike

8000 kili - Babidi's Guard

8110 kili - Savage Rush

8660 kili - Warp Kamehameha ( Kid Buu )

10000 kili - Absorption ( Super Buu )

In Dragon World, defeat Nappa as Tien.

On the last level where you fight Kid Buu, when you start dig (press B) until a question mark appears over your head. Note: You can use any character.