Tidus is an optional boss in Final Fantasy X-2: International + Last Mission and Final Fantasy X-2 HD Remaster. He is fought in the Fiend Arena in the final tournament, the Farplane Cup. Tidus will join the player's party after being defeated. In the HD Remaster version, if he is released without the default name of ????, he cannot join the Gullwings again.
Tidus has high Agility and can cast Hastega on himself making him even faster.
Tidus is somewhat powerful if the player is not at a high enough level, or if they do not have sufficient defense. Level 99 and Champion Belt will take care of part of it, while Rikku's Mascot ability Power Eraser will help lower his attack power. If Power Eraser is used three times it will bring Tidus's attack power down to -x10, the max.
The player should make Rikku cast Dispel once Tidus casts Hastega on himself. The player should make Yuna and Paine attack with Moogle Beam and Cactling Gun to deal the most damage possible. The player should use Moogle Regenja on the party to get a slight upper hand.
Once Tidus has been defeated in the Fiend Arena and the player reaches the end of the Farplane Cup, they will be given the option to recruit Tidus. He can learn his Overdrives Spiral Cut and Blitz Ace from FFX as abilities.