What was your party?

I used Rikku, Tidus, and Yuna

I had a Auron type Tidus, who dealt great damage once the enemy was weakened by Armour break

I had a Lulu type Yuna, who dealt great damage with Holy and Ultima. Also was great for healing

I kept Rikku the way she was and abused her item using skills. She made great use of the items I got from the Omega Ruins :D

Well for the most part I would use every character in a battle, I just liked to be even and lvl them all up at the same pace. But if I was in a big battle I would most likely use Tidus, Wakka, and Auron. All three of them were complete powerhouses and once I finished with Tidus's sphere grid I went to Aurons, once I was finished with Wakka's I went to Aurons also, and Auron went on Tidus's path.

I never used all seven party members. My first party was Auron, Lulu, and Kamahri. Auron was for pure, raw power. Lulu was my Blk. Mage, of course. And Kamahri was a back-up Blk. Mage. But since I couldn't defeat the final boss with them, I decided to start the game over with a new team. Thus, my final team consisted of Tidus, Yuna, and Auron. Auron and Tidus were used for raw power, and Yuna was my Wht. Mage and Blk. Mage. This team was so powerful that I defeated Omega with little effort. XD

Auron was used to hit the enemy.
Yuna healed everyone.
And Tidus was there to hit the enemy and protect/heal Yuna every once in a while.

I had this for most of the game. I beat Jecht with that party also.