Hey there!

This guide is written for anyone having trouble beating the Luca Goers in the blitzball tournament.

"So, why should I even try it?"
Three reasons:
- You win a strength sphere (transforms one unused node into +4 strength)
- Slightly different cutscene after the match
- You kick their arrogant asses

Step one:
Prepare yourself.
If you are playing FFX for the first time, make sure you know how Blitzball works at all.
Try to learn the Jecht Shot on S.S. Winno. You don't need it, but it helps a lot since it takes out two defenders while shooting.
Make sure you save the game by yourself right before the game starts. The game will autosave in half-time and after 8 minutes, when Tidus exchanges for Wakka.

Step two:
The first half.
In this half you are going to play defensive. Immediately change the controls to manual mode, so you can actually control your players.
Make sure Tidus throws at least one successful pass, so he gets some EXP and can level up in half-time.
That's it basically. Try to avoid the Luca Goers getting the ball, it is a good strategy just to throw passes between your players to gain EXP, most likely Letty and Jassh.

Step three:
Half-time.
Equip Tidus with the Jecht Shot, if you have it. If not, leave the sphere shot.

Step four:
The second half.
Now we're getting serious. After 3 Minutes of the 2nd half, Tidus exchanges for Wakka.
That stops any action, even if you are shooting right now.
So make sure you pass to Tidus fast and go for the Jecht Shot / Sphere shot. Remember that the Jecht shot takes out two of the Goers' players.
Laudia's keeper skills aren't that good, since the Jecht shot gives you are +5 goal boost, the ball should usually go into the goal easily.
After Wakka has exchanged for Tidus, don't go in defense!
Wakka's poison shot only costs 20 HP and gives him a +3 goal boost.
So, just play as you normally would with Tidus.
Most likely, the result is 2:0 or 2:1 for the Aurochs if you follow this guide.

Please let me know if there is anything to add, and thanks for reading.