^damn. i'll get it anyway and see if it works.
yeah, i didn't know either but i found it by accident when i pressed start. it's the lower right option. you know it's the correct one if you see a diagram of the buttons with japanese text everywhere. tap on and then resume play and suddenly the buttons are responsive.
you don't have quite as much control as with the stylus - like you can't determine which side you dribble on like you could with the stylus, but it's easier to handle imo.
offense:
x - shoot/dunk
b - dribble faster
y/a - pass left or right respectively
L - change character
defense:
x - jump - double tap to do weird green spinning move
b - steal - hold to make that blocking 'window' come up
y/a - dash left or right respectively
you still need to use the touchpad for super moves. i use my thumb since i'm used to playing jumpsuperstars but i suppose you could hold the stylus.
last, i take back my comment about this being easy. it's no sweat beating the comp until you get to the last round of the rainbow cup when you play the first final fantasy team (ninja, white mage, and black mage). i've been playing for several hours against them and i still can't beat them.