Red dragon archfiend, Stardust dragon, black rose dragon, etc...
Added 2 Jul 2009, ID #2878
These cheats are only for getting the strongest cards but by completing these events it will get you most of the cards.
Stardust Dragon- beat story mode once
Red Dragon Archfiend- beat story mode 2 times then beat Jack Atlus 10 times then beat the gold cup
Black Rose Dragon- beat Akiza Izinski 10 times in story mode then beat the gold cup
Iron Chain Dragon- beat the facility chief 10 times then beat silver cup
Gadget Hauler- beat Leo 10 times in story mode then beat the bronze cup
Flying Forretree SKY FIRE- beat grieger 10 times in story mode then beat gold and platinum cup (maybe just gold cup can't remember)
Blue eyes White Dragon- beat gold cup only come in first place in every race
Skull Collector- beat gold and platinum cups
Masked Knight lv7- beat platinum cup 2 times
Goyo Guardian- beat officer Tetsu Trugde 10 times in story mode then beat bronze and silver cups
Great Ushi Oni- beat Bolt Tanner 10 times in story mode then beat silver cup
To get all other cards just keep beating everybody in story mode at least 10 times or until they don't give you cards anymore heres a tip: DO NOT GO TO GOLD OR PLATINUM CUP UNTIL YOU HAVE BEATEN EVERYBODY IN STORY MODE AT LEAST 10 TIMES BECAUSE GOLD AND PLATINUM CUPS ARE REALLY HARD beating people in story mode will get more and some good cards