Dragon Ball Z: Budokai Cheat Codes

Super Vegeta
You can unlock Super Vegeta when you complete the "Vegeta's Confidence" episode.

Alternate appearance
Press Square or Circle at the character selection screen. Your character may have different clothes or colors.

View alternate costumes
Press R1 and R2 at the Capsule change screen to view the character's alternate costumes. Press L1 and L2 to zoom in and out. Use the Left Analog-stick to rotate the characters.

Alternate levels
Press Square instead of X when selecting the Cell, Valley, and other levels for a different appearance.

Make your Character Taunt
Press P + K + G + E to taunt. It will lower your opponent's Ki gauge by 1.

Powering up
Hold X and tap Back(2), and hold Back after you tap it again.

You can unlock trunks when you complete the "Perfect Form Cell Complete" episode