Overdrives
Tidus
Tidus' overdrives are determined on how close you get to the white area in the center of his overdrive bar, the little cursor bounces from side to side and by pressing X you stop it, for the best overdrive power you must stop it in the white area.
Tidus learns new overdrives by performing older ones a set number of times.
Spiral Cut
Tidus starts with this overdrive, it damages one enemy.
Slice & Dice
Perform "Spiral Cut" 10 times, attacks random enemies six times.
Energy Rain
Perform "Slice & Dice" 30 times, attacks all enemies
Blitz Ace
Perform "Energy Rain" 80 times, slices an enemy 8 times then launches a Blitzball at them (+1).
Yuna
Grand Summon
Summons one Aeon with full overdrive guage.
Wakka
Wakka's attacks are determined by matching slots on a slot machine, you earn new Overdrives for Wakka by winning Blitzball games.
Elemental Reels
Deals elemental damage.
Attack Reels
Deals damage.
Status Reels
Adds a status effect to attack.
Auroch Reels
Inflicts heavy damage on an enemy.
Kimahri
Kimahri's Overdrives are learnt by leaching them off enemies using the Lancet skill.
Lulu
Fury
Deals multiple attacks of a Black Magic Spell.
Auron
For Auron's overdrives you must input a series of buttons for the overdrives full power.
Dragon Fang
Auron starts with this, it deals moderate damage.
Input: Down + Left + Up + Right + L1 + R1 + O + X
Shooting Star
Learnt after defeating Spherimorph, shoots an enemy (not bosses) out of the fight.
Input: Triangle, O, Square, X, Left, Right, X
Banishing Blade
Collect 3 Jecht Spheres, this attack does a huge amount of damage as well as inflicting, Power Break, Mental Break, Magic Break etc.
Input: UP, L1, Down, R1, Right, Left, Triangle.
Tornado
Collect 10 Jecht Spheres, damages all enemies.
Input: X, Right, R1, Left, L1, Triangle.
Rikku
Mix
Mix to items together for an outcome.