Clear event battle with: Luffy-------------------------Smoker(Chaser) Zoro (zolo)-----------------Buggy Nami-------------------------Arlong Chopper---------------------Bon Clay (Robin) Ms.Sunday-------Crocodile Sanji--------------------------Don Krieg Chopper---------------------Foxy Usopp------------------------Kuro Luffy's crew, a picture should flash, go to Grand Tours and just play a regular tournament -- Enel everyone, then play Event Battle again with Luffy and beat Aokiji with a level 2 special -- Aokiji Zoro on Hardest difficulty. Beat Mihawk with Zoro's level 2 special after getting hit with Mihawk's level 2 special. -- Mihawk Luffy on the Very Hard difficulty after unlocking all previous characters -- Shanks

or just use this cheat:

To enter a code, you must first clear Story Mode with any character at any diffculty setting. After you defeat you last opponent and the credits will appear, enter the following codes while the credits are scrolling up the screen: (You can only enter one code after each time you clear story mode)

Effect Code Arlong-------------------------Hold L and pressDown Down,X,X,A,A,Down,Down,Down,Down,Down,Left,Down Buggy the Clown-----------Hold L and Press A,Right,Right,Right,Right,Right,Right,A,A,A,X,X,X Smoker(Chaser)------------Hold L and press B,B,X,X,A,ADown,Down,Up,Up,B,B,B Chopper----------------------Hold R and press B,Down,L,Up,A,Right,X,Down,X,Down,Y,Right,A,Left,L,X Don Krieg--------------------Hold L and press Down,Down,B,B,B,B,B,Right,Right,A,A,A,A Kuro---------------------------Hold L and press X,X,X,X,Left,Left,Right,Right,Right,Y,Y,Y,Y Mihawk-----------------------Hold R and press Right,L,Up,B,Up,L,Right,Y,Left,X,Left,A,Down,A,Left,L (Robin) Ms.Sunday--------Hold R and Press Up,Y,Up,A,Down,X,Up,B,Right,B,Left,A,Right,Y,Down,L Shanks------------------------Hold R and press Right,B,Left,A,Left,L,Right,B,Right,L,Down,A,Left,B,Right,Y

There should be a sound at the end that confirms you input a code