Easy Chocobo races
While racing a Chocobo, hold [Page Down] + [Target] to slowly restore energy.
This trick requires the W-Item materia. The materia is obtained after your party parachutes back into Midgar in Disc 3. After entering the subway tunnels in Sector 8, your party may walk away from the screen and encounter the Turks, or walk towards the screen to reach another subway section. Select the second choice and follow the subway tunnel until it ends at a dead end with the W-Item materia.
Equip the materia on the character with the item to be duplicated. When a battle begins, select the W-Item entry on the battle menu and pick the item to be duplicated. Answer "OK" to confirm the selection and choose the person to receive the item. When selecting the second item, choose the item to be duplicated. Answer "OK" to confirm the selection, but cancel before choosing a person to receive the item. Now the amount of that item should have increased by one. This may be repeated to increase the total number of that item to 99.