Duel Masters: Cobalt - Play as Chuck

Play as Shobu:
Select versus mode and let player two choose a character. Then, have player one press [R2]x2, [L1], [R2], [X].

Cards do not run out in duel:
Hold [R3] and press [Square]x3.

Remove shield:
Hold [R3] and press [Triangle], [Square], [X] to remove one of player one's shields. Hold [R3] and press [Triangle], [Circle], [X] to remove one of player two's shields.

Add shield:
Hold [R3] and press [X], [Square], [Triangle] to add one shield for player one. Hold [R3] and press [X], [Circle], [Triangle] to add one shield for player two.

Win duel:
Hold [R3] and press [L1], [R1], [L1] to give player one the win. Hold [R3] and press [R1], [L1], [R1] to give player two the win.

Additional locations:
Hold [R3] and press [Circle]x3 at the map screen.

Additional cards:
Hold [R3] and press [L1]x3 at the deck building screen. You will get four of each card.

Card Multiplication:
To perform this cheat you need two memory cards.
Copy your file on to the second memory card and go to Card Trading. Trade as many cards as you wish from memory card 2 on to memory card 1 and voila more cards

Unlock Knight:
To get Knight, complete everyone's story.

Unlock Marcus:
To get Marcus, complete Flynn's story.

Unlock Monks:
To get the monks, you must defeat them the first time.

Unlock Sera:
To get Sera, complete Luc's story.

Unlock Widow:
To get the Widow, defeat her at the end of the tournament.

Unlock Caitlan:
To get Caitlan, complete Rusty's story

Unlock Earl:
To get Earl, complete Trey's story

Unlock Jalen:
To get Jalen, complete Rebecca's story.