Tidus’s Overdrives in Final Fantasy X are called Swordplay. All of his Swordplays do damage to either a single target or all targets, and you can get them at any point in the game, though it will take some time.
How to Use Swordplay
All of Tidus’s Swordplay attacks have the same mechanic to use. When executed, you will see a timer and a meter, with a small gold section in the middle of the meter and a marker going back and forth. Your goal is to hit when the marker is in the middle of the meter, and to do it before the timer runs out.
Swordplays and How to Obtain Them
Getting all of Tidus’s Swordplays is pretty straightforward. All you need to do is use his current Swordplays a certain amount of times, and he will automatically learn a new one.