How to get cards
To get a card finish an opponent (2nd victory) with a POW move (F,B,D+A). Your POW meter must be at max. If you finish an opponent with this move, a card will be awarded to you. 

Play as Yoka
First, move to character Kuroko, then hold button B and rotate the control counter clockwise for 3 to 4 circles. Then Yoka will appear on the space where Kuroko belongs. Remember to keep holding B and select it by press A.