All-Star teams:
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle, Start to unlock the All-Star teams.

Copy Players:
Go to preferences at the main menu, and choose Team Edit.Select the player you wish to copy and press Square. A long password will appear. Write the password down, and when you choose Create Player in the preferences menu, choose password, and enter the password.