Final Fantasy 10

Special attack:
Press R1, R1, L2, Triangle, Triangle, Circle, Circle, Circle, L2

Hidden location X coordinate : Y coordinate
Baaj Temple -- X:14 Y:60 (find Lulu's Onion Knight and Anima here)
Sanubia Desert: X:15 Y:41 (find Tidus's Ascalon)
Omega Ruins: X:74 Y:36 (battle Ultima Weapon, steal items, and find spheres)
Besaid Falls: X:31 Y:73 (find Kihmari's Dragoon Lance)
Mi-I'hen Ruins: X:34 Y:58 (find Rikku's Sonar here)
Battle Site: X:42 Y:57 (find Lulu's Phantom Bangle here)

Airship passwords
Enter the following case-sensitive passwords at the airship command list
in to "Input" option to access secret locations:

VICTORIOUS -- Ruins of Besaid. Climb the tree to get Victorious armor.
MURASAME -- Ruins of Besaid. You will get Auron's Murasam here.
GODHAND -- Go to lower Mushroom Rock Road, you should find Rikku's
legendary weapon.

In-game reset:
Press L1 + L2 + R1 + R2 + Start + Select during game play.

Get lots of AP
After you kill Seymour the 1st time just return to Macalania Temple
and fight the Guado.

Easier Chocobo handling
Hold L1 + L2 + R1 + R2 and your Chocobo will be easier to steer.

Beat Evrae Altana easily:
Use 2 or 3 Phoenix Downs on it