So far in the game Auron will only have two overdrive moves, which are crap. To get the rest of his moves you need to collect the 10 spheres around Spira. They can be found once you have acquired the airship. They are found?
1. In Macalania Woods when you defeat Spherimorph.
2. To the right of the temple entrance in Besaid village.
3. In basement A in Luca.
4. In the captains cabin in the S.S.Liki when you board it from Besaid.
5. At the end of the Old Road at Miihen Highroad...
6. Just south of the mechanical lift at Mushroom Rock Road.
7. At the south wharf at the Moonflow.
8. Southwest of the agency in the Thunder Plains.
9. Right of the first save point in Macalania Woods.
10. At the mountain trail dead end in the Gagazet Mountains.