FINAL FANTASY X UNLOCKABLES
Hidden ending
Upon beating Yu Yevon and the FMV sequence begins, allow all the credits to complete. You will see spirits start to gather, like the orbs before Jecht and it will show Tidus swimming to the top of the lake Yuna was looking towards at the end.
Auron
GEt different Jecht Spheres laying about the world. Some of these will give Auron a new Overdrive. You need to ascertain all ten to get Auron's final Overdrive.
Kimari
Use the Dragon Sword ability to drain HP and MP from the enemy. If the enemy has a Blue magic skill that Kimari can learn, he will gain it automatically. The only one that is difficult to get is "Sunshine", which you obtain from the Omega Weapon.
Lulu
Rotate the Right Analog-stick clockwise as fast as possible. The number will go up the more you rotate it. The more you level Lulu up, the easier it is to cast multiple spells.
Rikku
Rikku's Overdrive combines items to create special attacks and power-ups during battle. You have to choose any two items to combine. REMEMBER: Two of the same kind will work.
Tidus
Just keep using them over and over. After a while, he will learn his next Overdrive.
Wakka
You can win new Overdrive roulette (slots) types in the Blitzball Ranking and Tournament modes.
Hidden ending
After Beat Yu Yevon and the FMV sequence begins, allow all the credits to complete. You will see spirits start to gather, like the orbs before Jecht and it will show Tidus swimming to the top of the lake Yuna was looking towards at the end.
Rikku Weapon
Go to the Airship and insert the code GODHAND