Go to the Player vs. Player character select screen, then hold L + R on both controllers for a few seconds. If you did it right, the question marks (?) at the bottom of the screen will be replaced by bosses.
After the title screen select 1 player game, then the third selection, then the second and enter the following chain.
Enter these at the 1P vs. password screen. When it says ERROR! keep pressing the B button to backup to the menu that says new game and password and select new game. Choose a difficulty level and start the game. Now when you loose it will say you have 43 or 90 continues.