One Piece: Gigant Battle
Could it be? An english One Piece game?!
I find it weird that they localize this game now. I mean the graphics look the same as Jump Superstars but with less characters.
I guess if you REALLY like One Piece then maybe check this game out (Jump Superstars was sooo good, I just can't read Japanese) because this is probably the closest we'll get to an english Jump Superstars.