CheatCodes.com has all the official Duel Masters PS2 cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday June 19, 2013 for Duel Masters are shown below.
Hold R3 while entering Circle, Circle, Circle.
Hold down R3, and then press X, Circle, Triangle.
Hold down R3, and press Triangle, Square, X.
Press and hold R3, and then press R1, L1, R1.
From the main menu select Arcade Mode and then select Deck Build. At the Deck Select screen press and hold R3, and then press L1, L1, L1.
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