Cheats
Valefor's Second Overdrive;
To gain Valefor's second Overdrive talk to the woman in Besaid and she will say her dog has dug up something press X on the dog and he will drop something containing Energy Blast, Valefor's second Overdrive.
Break HP Limit;
To break your HP limit you must first get 30 wings of discovery or 30 door to Tomorrow Bribe a Marlboro and get 8 of them for 500,00 gil or 5 for about 200,000 gil.
Free Potions;
On board the SS Liki on your way to Luca there will be a back press X on the bag and keep pressing X until you get 10 free potions.