I used King for this since he does a roll with the opponent once he has reversed a move. It is also best to go into Practice Mode to do this as well. So pick King and a random person and press start to open up the training menu. Press Mode Select and go to the bottom and press "VS CPU TRAINING" so that the computer will start to attack you.
As the computer is attacking you keep pressing (or if you are on the right side of the screen) + + until King reverses his opponent. Repeat two more times.
Alternately, you can select Asuka and use + + or + + and she will go into a defensive stance. When the CPU hits her she will more than likely reverse it (Thanks to SUBJECT BK201 for the tip).