Final Fantasy X Cheats

After you've defeated Yunalesca at the Yevon Dome in Zanarkand and aqquired the airship, search for these locations by using the X and Y coordinates:

Valefor also has a second Overdirve that you can acquire once Yuna join the party. Return to Besaid and speak to the little girl with a dog standing next to the temple, and you'll receive an item that gives Valefor the Overdrive Energy Blast. If the little girl isn't near the temple, then look for her inside the item shop. Energy Blast inflicts greater damage at the cost of a higher recovery time.

There are also hidden locations accessible by using the "Input" feature found in the airship command list. You can find these passwords by deciphering Al Bhed messages left in specific locations around Spira. Note that all of the passwords are case-sensitive.