From Final Fantasy Wiki

The abilities that can be mastered in Final Fantasy X are learned by navigating the Sphere Grid and activating nodes for each party member.

Skills

• Sleep Attack - Inflict Sleep Status for Three Rounds
• Silence Attack - Inflict Silence Status for Three Rounds
• Dark Attack - Inflict Dark Status for Three Rounds
• Sleep Buster - Inflict Sleep Status for One Round (Higher effectiveness)
• Silence Buster - Inflict Silence Status for One Round (Higher effectiveness)
• Dark Buster - Inflict Dark Status for One Round (Higher effectiveness)
• Zombie Attack - Chance of inflicting Zombie Status
• Triple Foul - Chance of inflicting Sleep, Silence and Dark
• Delay Attack - Halt Enemy's next turn slightly
• Delay Buster - Halt Enemy's next turn greatly
• Power Break - Lower Enemy Strength
• Magic Break - Lower Enemy Magic
• Armor Break - Lower Enemy Defense and nullify Armoured
• Mental Break - Lower Enemy Magic Defense
• Mug - Steal Item and inflict damage
• Quick Hit - Attack quickly with short recovery period

International and PAL Only

The following abilities are available only in the International and PAL/European versions of FFX.

• Extract Power - as with the Distiller items, fiends drop the relevant spheres after the battle.
• Extract Mana
• Extract Speed
• Extract Ability
• Nab Gil - Steal Gil and inflict damage
• Full Break - Inflict all Break Status Effects

Special

• Steal - Steal item
• Use - Use special items
• Flee - Escape from battle
• Pray - Restore small amount of HP to active party
• Cheer - Raises Strength and Defense (can be stacked 5 times)
• Aim - Raises Accuracy (can be stacked 5 times)
• Focus - Raises Magic and Magic Defense (can be stacked 5 times)
• Reflex - Raises Evasion (can be stacked 5 times)
• Luck - Raises Luck (can be stacked 5 times)
• Jinx - Lowers Enemy Luck (can be stacked 5 times)
• Lancet - Draw HP and MP from enemy
• Guard - Take physical damage in place of teammates
• Sentinel - Take physical damage in place of teammates while in defensive stance
• Spare Change - Throw gil at enemy for damage
• Threaten - Inflict Threaten (Stop) status on enemy
• Provoke - Entice enemy to attack specific party member only
• Entrust - Transfer overdrive gauge to teammate
• Copycat - Imitate last action taken except Overdrive or Summon
• Doublecast - Cast two consecutive Black Magic Spells
• Bribe - Offer Gil to an enemy to leave the battle

International and PAL Only

• Pilfer Gil - Steal Gil
• Quick Pockets - Use an item with short recovery period