Unlockable Popup Duel Cards:
Go to “present” in the main menu and select the 2nd (blue text) option, “popup duel present.” Then, unlock the following cards by entering the corresponding codes:
CARD – CHEAT CODE
Chocobo Card “Hip Attack” – X-A-Y-LEFT-UP-Y
Madora Dark Card “Mist Grass” – B-UP-L-X-Y-RIGHT
Omega Card “Rocket Punch” – LEFT-Y-UP-R-LEFT-X
Ragnarok Card “Sword of Destruction” – A-L-B-A-DOWN-R
Shinryu Card “Cruel Angel” – R-A-R-RIGHT-X-UP
Ultima Weapon Card “Shadow Flare” – Y-X-DOWN-B-R-A?