Enter Y, Black, White, Black, Y, X, White, X at the cheats screen under the options menu. All cheats will be unlocked. Alternately, enter Y, X, B, X, Y, A, B, A at the cheats screen under the options menu.

Enter Black, Y, X, White, Y, Black, X, X at the cheats screen under the options menu.
Enter White, Black, X, Y, White, Black, X, Y at the cheats screen under the options menu.
Enter White, White, X, X, Y, Black, Y, Black at the cheats screen under the options menu. All normal game options will be unlocked.
Enter X, X, X, X, Black, Y, X, X at the cheats screen under the options menu.
Enter Black, Black, Black, Black, White, X, Black, Black at the cheats screen under the options menu.
Enter Y, X, Black, White, Black, X, Y, White at the cheats screen under the options menu.
Enter X, X, X, X, X, X, X, X at the cheats screen under the options menu.
Enter White, White, White, White, White, White, White, White at the cheats screen under the options menu.
Enter Y, Y, Y, Y, Y, Y, Y, Y at the cheats screen under the options menu.
Enter Y, X, Y, X, Y, X, Y, X at the cheats screen under the options menu.
Enter X, X, Y, White, Y, White, Black at the cheats screen under the options menu.
Enter Y, White, X, Black, Y, Black, X, White at the cheats screen under the options menu.
Enter Black, X, Black, Y, X, Black, X, Black at the cheats screen under the options menu.
Enter Black, Y, Black, Y, X, X, White, White at the cheats screen under the options menu.
Enter Black, Black, Black, Black, Black, Black, Black, Black at the cheats screen under the options menu.