Hold L & R and press square, square, triangle, triangle.
Unlimted Gamebreaker, All Levels, Unlimited Deveopment Points :
Go to the main menu and type in this code: up,x,x,square,square,cirle,down,x,up
Unlock All Courts :
In the middle of a game in King Of The Courts hold R and L and press X,B,A,Select to unlock all courts.