One Piece Grand Battle Codes -

Mr. 2 Bon Clay:
First, unlock characters one through fourteen. Then, use Sanji in story mode at any difficulty level. Hold and press (x2), , , , , , , , , , , , (x2), during the ending credits.
Unlock Mr. 2 Bon Clay. You will hear a sound if you have entered the code correctly.

Alternately, first, complete story mode as Luffy, Zolo, Nami, Usopp, and Sanji. Then, complete story mode as Buggy, Kuro, Chaser, Krieg, and Arlong to unlock Ms. Sunday/Nico Robin. Next, complete story mode as Luffy under hard difficulty to unlock Tony Tony Chopper. Then, complete story mode with ten characters under hard difficulty to unlock the very hard difficulty setting. Next, complete story mode as Luffy under the very hard difficulty setting to unlock Red-Haired Shanks. Then, play through storm mode as Zolo under very hard difficulty, and defeat Hawk-Eye Mihawk with a secret attack (Three Thousand Worlds) to unlock him. Then, complete story mode as Sanji, then hold and press (x2), , , , , , , , , , , , (x2), during the ending credits. A sound will confirm correct code entry.

Mr. 0 Crocodile:
First, unlock characters one through fifteen. Then, select Ms. Sunday in story mode at any difficulty level. Hold and press , , , , , , , , , , , , , , , during the ending credits. You will hear a sound if you have entered the code correctly.

Alternately, after unlocking Hawk-Eye Mihawk in the "Mr. 2 Bon Clay" code, complete story mode as Ms. Sunday/Nico Robin, then hold and press , , , , , , , , , , , , , , , during the ending credits. A sound will confirm correct code entry.

Chopper's third costume:
Hold , then press , , , , , , at the "Press Start" screen.

Luffy's third costume:
Hold , then press , , , , , (x2) at the "Press Start" screen.

Nami's third costume:
Hold , then press , , , , , , at the "Press Start" screen.

Robin's third costume:
Hold , then press , , , , (x2) at the "Press Start" screen.

Sanji's third costume:
Hold , then press , , , , , , at the "Press Start" screen.

Usopp's third costume:
Hold , then press , , , , , , at the "Press Start" screen.

Zolo's third costume:
Hold , then press , , , , , , at the "Press Start" screen.

Chopper's fourth costume:
Hold , then press , , , , , , , at the "Press Start" screen.

Luffy's fourth costume:
Hold , then press , , , , , (x2), at the "Press Start" screen.

Nami's fourth costume:
Hold , then press , , , , (x2), , at the "Press Start" screen.

Sanji's fourth costume:
Hold , then press , , , , , , , at the "Press Start" screen.

Usopp's fourth costume:
Hold , then press , , , , , , , at the "Press Start" screen.

Zolo's fourth costume:
Hold , then press , , , , , (x2), at the "Press Start" screen.

Mr. 2 Bon Clay: Secret attacks:
Instead of holding and pressing + to use a random clone-clone attack, try the following moves to transform instead. By doing this, you can use strategy instead of luck for which character you will transform into.

Mr. 7: While holding , press (x4), .
Mr. 8: While holding , press (x3), .
Mr. 9: While holding , press (x2), .

Sanji: Easy win:
When the fight starts, use a Leg-O-Wham Supreme. Get food, then do another Leg-O-Wham Supreme .keep doing it until you win.

Special moves:
Every character has special moves. For the first, press + . For the second, hold and press + .