Control opening screen
Rotate the C-stick to spin Master Roshi. Press the Analog-stick to change his position on the screen.
Alternate costumes
When fighting in training or duel modes, you can change your character's costume by pressing B so that you will turn to the question mark. Then, press A to choose a character. They will have different costumes. For example, Piccolo will look like Nail and Gohan will fight in his father's costume.
To change costumes, go to the character and press Up or Down. You will be able to select a different costumes. Some characters may have three choices but most have only two.
Golden Capsule on level one
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 Super Buu
Get 2400 kili in Babidi's Spaceship.
Unlock Majin Buu
Get 1200 kili in Babidi's Spaceship.
Unlock Super Buu's Absorbtion Technique
Get 10,000 kili.
Unlock Kid Buu
Get 3600 kili in Babidi's Spaceship.
Cheats
All these must be done in Dragon mode.
Effect - Code
Adept World Tournament - Unlock 16 Characters, then buy it from Bulma
Advanced World Tournament - Unlock all 29 Characters, then buy it from Bulma
Android 16 - Beat Android 16 with Goku.
Android 17 - Beat Android 17 with Piccolo.
Android 18 vBeat Android 18 with Krillen.
Android 20 - Beat Android 20 with Goku.
Babidi's Ship - Collect All 7 Dragon Balls and Wish for it from Shenron.
Babidi's Spaceship - Wish for it on the Dragonballs
Breakthroughs - Wish for them with the Dragonballs
Bulma's costumes2/6 - Wish for them on the Dragonballs
Cell - Beat Cell with Goku.
City Street Stage - Beat super Buu with gohan on stage 8 without being defeated
Dabura - Get 100 Kili on Babidi's Spaceship.
Frieza - Beat Frieza with Goku
Future Trunks - Beat Vegeta on Namek with Kid Trunks.
Ginyu - Beat Ginyu on Namek with Vegeta.
Gokule(capsule) - Get Goku and hercule's breakthrough
Gotenks(Capsule) - Once enteared stage 7 it's yours
Hercule - Beat Fat Buu with Great Saiyaman stage 6.
Kabitoki(Capsule) - Wish for it on the Dragonballs
Kabitoshin (Potara) - Collect seven dragonballs and wish for the capsule from the Dragon.
Majin Vegeta - Dragon World, Stage 5, defeat any Majin character to get the Capsule that allows you to get Majin Vegeta. (Dabura does not count.)
Nappa - Beat Nappa with Vegeta (can only be done when you unlock Vegeta and start Dragon mode again).
Raditz - Beat Raditz with Goku.
Recoome - Beat Recoome with Goku.
Saiyaman - Beat Cell with Gohan (adult) only.
Silver Membership Card - Have a Budokai 1 save on your memory card when you start a New Game
SSJ2 Gohan (adult) - Defeat Majin Vegeta before Majin Buu kills Babidi in Stage 6 (the area with the large ring)
Super Saiyan 2(Goku) - Beat Cell on stage 4 with Goku
Super Saiyan 2(Vegeta) - Beat Super Buu(Gohan) as Vegeto Stage 8
Super Saiyan 3(Goku) - Beat Majin(Fat) Buu on stage 6 with Goku
Super Saiyan(Goku) - Let Krillen die on Stage 3.
Supreme Kai - Beat Supreme Kai with Goku.
Teen Gohan - Beat Cell for the last time on Supreme Kai's planet with Adult Gohan.
Tiencha(Capsule) - Get both Breakthoughs of Tien and Yamcha
Vegeta - Beat Vegeta with Goku on Namek.
Vegeto(Capsule/Goku) - Get Goku to Surpreme Ki then to Vegeta Stage 8
Vegeto(Capsule/Vegeta) - Wish for it on the Dragonballs
Videl - Beat Super Buu(Gohan) as Hercule Stage 8
Yamcha - Beat Nappa with Tien.
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