One Piece: Grand Adventure Cheats

Characters
Beat Crocodile in Luffy's adventure mode to unlock Buggy and Mr. 0 Crocodile's adventure mode, continue with Luffy's adventure and defeat Eneru to unlock Chaser's adventure mode.

Unlockable How to Unlock
Nico Robin In Luffy's adventure mode, use her once in battle after she joins the crew.
Red-Haired Shanks In Buggy's adventure mode, use him once in battle after he joins the crew.
Portgaz D. Trace In Buggy's adventure mode, use him once in battle after he joins the crew.
Mr. 2 Bon Clay In Mr. 0 Crocodile's adventure mode, use him once in battle after he joins the crew.
Ohm In Mr. 0 Crocodile's adventure mode, use him once in battle after he joins the crew.
Eneru In Mr. 0 Crocodile's adventure mode, use him once in battle after he joins the crew.
Chaser In Chaser's adventure mode, get Chaser to Lv. 15 and use him once in battle.
Kuina In Chaser's adventure mode, get Kuina to Lv. 15 and use her once in battle.
Zeff In Chaser's adventure mode, get Zeff to Lv. 15 and use him once in battle.
Hawk-Eyes Mihawk In Chaser's adventure mode, use him once in battle after he joins the crew.
Support Characters In adventure mode, use a support character in 3
battles, then they can be used by any character in Grand Battle mode.

Unlockables
One Piece: Grand Adv. UnlockablesUnlocking Extra Costumes- Straw Hat Pirates
All Straw Hat characters but Vivi start with their 1P and 5P costumes, and in Robin's case the 4P as well. In general, 4P costumes will be found first, while 2P costumes appear later in the game and are more complicated to get. Any costumes unlocked in Adventure mode will be usable in every other mode.
In unlocking Luffy's 2P costume, make sure not to fight Crocodile until after you have travelled to Jaya and are prompted to finish Crocodile before proceeding, or your game will end at the Crocodile fight.
An easy way to beat Ace(Trace) with Chopper in the Graveyard of Ships is to use Chopper's "Health" attack (Jump+O) non-stop. Beware of rolling bombs.

Unlockable How to Unlock
Luffy 2P Obtain the bonus item "Pirate Coat" by beating Crocodile the first time at Alubarna in the Alabasta Kingdom Sea area with a super attack
Luffy 4P Obtain the bonus item "Cool Shades" by beating Buggy with an item at Orange Village in the Orange Village Sea area
Zolo 2P Obtain the bonus item "Goggles" by beating Arlong at Spice Village in the Jaya Sea area
Zolo 4P Obtain the bonus item "Necklace" by staying alive for 30 counts against Hawk-eye Mihawk at Blue Town in the Syrup Village Sea area
Sani 2P Obtain the bonus item "Gaudy Shirt" by beating Don Krieg at
Vinegar Village in the Jaya Sea area with Sanji
Sanji 4P Obtain the bonus item "Necklace" by beating Chopper at Big Horn in the Drum Kingdom Sea area with Sanji
Nami 2P Obtain the bonus item "Yellow T-shirt" by beating Buggy at
Vermillion Town in Jaya Sea Area with Nami
Nami 4P Obtain the bonus item "Fashionable Sunglasses" by beating Chaser at Navy Base No.64 in the Inshore Alabasta Kingdom area
Usopp 2P Obtain the bonus item "White Bandana" by beating Kuro at Mock Town in the Jaya Sea area
Usopp 4P Obtain the bonus item "Sunglasses" by beating Nami at Coco
Village without knocking her out
Chopper 2P Obtain the bonus item "Santa Hat" by beating Ace(Trace) with Chopper at a Wrecked Ship in the Graveyard of Ships
Chopper 4P Obtain the bonus item "Panda T-shirt" by beating Nico Robin with Chopper at Erumalu in Alabasta Kingdom Sea area
Robin 2P Obtain the bonus item "White Hat" by beating Ohm the first time at the Ruins in Skypiea