Get points without playing:

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.