How do you beat Seymour 1 in FFX?

Seymour before Anima: Use talk with Tidus so his strength increases. Use any of his overdrives and when Seymour's HP is at 3000 or less he will summon Anima.

Anima: Survive until he does three boosts and then use blitz ace on him and he will die.

Seymour after Anima: Use blitz ace on him and he will take about 10000 damage and he only has 6000.