Collecting the Spheres unlocks Auron's overdrives
these require a button input for full power
*hits all enemies for slightly more than an ordinary attack
*only hits one enemy if the button sequence is not completed
*you start with this overdrive
Down dpad, Left dpad, Up dpad, Right dpad, L1 button, R1 button, Circle button, Cross button
*hits one enemy for high damage, may Eject them
*no Eject effect if button sequence is not completed
*collect one sphere to obtain
Triangle button, Circle button, Square button, Cross button, Left dpad, Right dpad, Cross button
*hits one enemy for high damage, inflicts all four breaks (100% chance) if enemy not immune
*only inflicts one random break if button sequence is not completed
*collect three spheres to obtain
Up dpad, L1 button, Down dpad, R1 button, Right dpad, Left dpad, Triangle button
*hits all enemies for high damage twice
*only hits once if button sequence is not completed
*collect all ten spheres to obtain
Cross button, Right dpad, R1 button, Left dpad, L1 button, Triangle button
There are 10 spheres to collect, you can begin collecting them after collecting the first, you may benefit from backtracking once they are unlocked.
Macalania Woods - Initial one after defeating Spherimorph
Besaid Village - Near the temple, on the right side of the temple.
Note, that you need to backtrack to get this before you get the airship, if you wait until afterwards you will be required to defeat Dark Valefor to get this one.
S.S. Liki - Board in Besaid. It will be in the captain's cabinet.
Luca Stadium - Just outside the Auroch's locker room.
Mi'ihen Highroad, Oldroad, South near to the chest containing the Mars Crest.
Mushroom Rock - Precipe - Close to the save sphere. The place where you spoke to Luzzu for the last time.
Moonflow South Warf - In front of the tent, same screen as save sphere.
Thunder Plains South - right hand side of the path about half way to the Travel Agency.
Macalania Woods - To the turnoff to Bevelle and the Calm Lands.
Mt. Gagazet Mountain Trail - small path leading off to the right after the second S- turn in the main path.