At the main menu, press L and "Dragon Click" will appear on the Dragon Radar. Press R to play a mini-game where you must press R repeatedly before time expires.

Successfully complete Dragon Road mode, then press L at the main menu. "Dragon Player" will appear on the Dragon Radar.

Defeat Broly in Chapter 2-6 of Dragon Road mode to unlock Adult Gohan (Super Saiyan 2 form).

Defeat Frieza in Chapter 1-8 of Dragon Road mode to unlock Adult Gohan (Super Saiyan form).

Defeat Cell in Chapter 2-5 of Dragon Road mode to unlock his Super Perfect form.

Successfully complete the last chapter by taking the bottom path to unlock Gogeta.

Defeat Krillin in Chapter 1-2 of Dragon Road mode to unlock Goku (Kaioken form).

Defeat Fake Goku in Chapter 2-2 of Dragon Road mode to unlock Goku (Super Saiyan 2 form).

Defeat Janemba in Chapter 1-9 of Dragon Road mode to unlock Goku (Super Saiyan form).

Defeat Gotenks in Chapter 1-4 of Dragon Road mode to unlock him.

Defeat Gotenks in Chapter 1-5 of Dragon Road mode to unlock his Super Saiyan form.

Successfully complete Story mode to unlock Janemba.

Defeat Cell in Chapter 2-1 of Dragon Road mode to unlock Piccolo (fuse with Kami Form).

Defeat Janemba in Chapter 2-9 of Dragon Road mode to unlock Pikkon.

Defeat Janemba in Chapter 2-7 of Dragon Road mode to unlock Vegeta (Super Saiyan 2 form).

Defeat Android #18 in Chapter 2-3 of Dragon Road mode to unlock Vegeta (Super Saiyan form).

Successfully complete the last chapter by taking the top path to unlock Vegeto.

Get a "Z" rank (by winning all fights quickly with most of your health) on the indicated chapter to unlock the corresponding card sheet:

No. 13: Chapter 1
No. 14: Chapter 2
No. 15: Chapter 3
No. 16: Chapter 4
No. 17: Chapter 5