Yeah, not impossible. I got lucky and had the ball at the beginning. I used Jassu or Letty to run (swim) on the side as soon as the defence went for him instead of tidus I passed to Tidus and he scored easily. If you score 4 goals while tidus is on you see him dance around (do flips) and it says "What an amazing comeback" (I was up 4-0 at the time, so not really a comeback). Anyways just always run it up the edge and it's not to hard to win.