You can earn free vs. points for the secret shop if you go to training mode, choose your characters and opponent, then just leave the game on for around 2 to 2.5 hours at the battle screen. After that time you will have earned about 999 vs. points. Note: 999 is the maximum number of vs. points that can be earned in one training match. To earn more points, simply exit training mode, enter again and repeat the process.