Right... here r tips:

1. Press Square on EVERYONE
2. If a little menu appears youre in luck, he plays blizball
3. Emply him if youlike.
4.You cant change teams sadly
5. Brother is the best Blitzer in the game so when u get on the airship, emply him
6. Tidus can earn Jecht shot 2 when hes level 16 and he enters a tournament. From then on, the liklihood of it appearing coresponds to his level (Ie hes level 50 you have a 50% chance of it appearing
7.You need to play Blitzball to earn wakkas utimate weapon,all three extra reels and the Jupiter Sigil
8. As a firsttime blitzer (In Luca) employ wedge from the stadium. He ones of the guards. He got great ATK and a good Shot.
9. Try to emply the following: Brother (Al Bhed) Ropp and Nimrook (Al Bhed) Two of them (Brother & Nimrook r opnly available when u get on the airship
10.Wakka will play again but personally, i thinks hes a bit rubbish

so there u are....more soon if u want it