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You can't. Jecht is never playable (either in battle and onscreen/blitzball) in Final Fantasy X. Although of relation, Tidus can learn Jecht's famous Blitzball move, the Jecht Shot (full name is the Sublimely Magnificent Jecht Shot Mark III) early in the game.

If you mean in Dissidia then you just have to practice with him until you get good enough to use him well.

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