Cheat: Blitzball Easy Win
There's no cheating like cheating in sports. When it comes to the Blitzball mini game in Final Fantasy X, you won't hear me complain about cheating (read: this part of the game was eye candy flavored padding).
Sure, you can get a lead in Blitzball, but can you maintain it? Also, who really cared about this lame non-sport? Anyway, when you are in the lead, swim behind your goalie. Everyone else will go to the other side and swim around. If an opponent is following you, just shake him loose. Stay behind the goalie until the game is over and easy win over and over again.