One Piece: Grand Adventure Unlockables
GameCube | Submitted by xdeidaraxArena Mode Unlockables
To unlock hard mode beat normal mode
To unlock hardest mode beat hard mode
To get a characters voice get a ranking of 39 or lower (beat someone with a rank of 39 or lower)
To get a characters pictures in the gallery, get a ranking of 29 or lower
PS2, GameCube | Submitted by Daniel CoolUnlockable Characters
Chaser - In Chaser's adventure mode, level him up until you have his secret attack to unlock him.
Eneru - Recruit him in Crocodile's adventure mode, and win a battle with him.
Kuina - Recruit her in Chaser's adventure mode, and level her up until you use her secret attack to unlock her.
Mihawk - Recruit him in Chaser's (Smoker) adventure mode, and win a battle with him.
Mr. 2 Bon Clay - Recruit him in Crocodile's adventure mode, and win a battle with him.
Nico Robin - Recruit her in Luffy's adventure mode, and win a battle with her.
Ohm - Recruit him in Crocodile's adventure mode and win a battle with him.
Trace (Ace) - In Buggy's adventure mode, you can recruit him in Drum Island. Win a battle using him to unlock him.
Shanks - Recruit him in Buggy's adventure mode, then win a battle using him
Zeff - Level him up and unleash his secret attack in Chaser's adventure mode to unlock him.
PS2, GameCube | Submitted by Daniel CoolUnlock Sound Test
Get all of the cards in the Arena and Grand Battle modes.
GameCube | Submitted by Vgame RoolerFinding Skypiea
When you go to Albasta you'll see a shipwreck - go there & fight Shanks, then go to the graveyard of ships fight Mihawk and win - he'll give you a compass that says Skypiea on it. Go to Jaya Island, then then go in the whirlpool - it will turn into a Waterspout & shoot you to Skypiea
One Piece: Grand Adventure Hints
GameCube | Submitted by Vgame roolerUnlock Shanks
When you play as buggy in grand adventure go to the Shipwreck Graveyard - the second shipwreck on the left is Shanks! Defeat him and his crew of Lucky Roux, Beckmann, and Yassopp and you unlock Shanks for grand battle mode!