Yes, when you see 3 kuribohs pop up on the screen, tap the 3 of them AT THE SAME TIME, if one of them (the lone one at the left) blinks at you, then most likely you will get a UR o SR card. I don't know if this is programmed in the game, but it seems to work
anoymous
Only way to increase your chances is to buy more packs-seriously