The Goers are actually pretty easy. Tidus can't use Jecht Shot straight away, because it costs 120. So use Sphere Shot instead for the first half. Just get your defenders to pass the ball between themselves, while slowly pushing forwards. When you get to about halfway, pass through to Datto. Don't get him to move toward the goals, rather try to break up the Goer defense by passing between Letty and Datto and swimmingly accordingly. Don't move too far back or Tidus will retreat back as well. When the coast is clear, pass to Tidus, make sure your pretty close to the goals because Raudy has 8 catch and Tidus can get about 20 shot tops, so position yourself well. You should score from this. I find it better to stall until about 3 mins into the first half before putting this plan into action, so it leaves less time for the Goers to even up the score afterward.

Second half, try to do the same thing, but you'll have less time with Tidus. When Wakka comes on, you can try the same with him but it's a little bit harder with Venom Shot.