Valefor
Valefor is the first Aeon that Yuna can summon, which you receive in Besaid, after conquering the Cloister of Trials. It looks like a large eagle, and therefore enemies on the ground have a harder time hitting it than other Aeons, because it can fly. Although Valefor starts out as a useful asset to your party, when you get the other Aeons, he will probably end up weak. Valefor's damage will be able to exceed 9,999 once Yuna activates her Celestial Weapon, Nirvana.
Special Attack: Sonic Wings
Valefor attacks an enemy with a burst of air from its wings. This attack can cause delay in the opponents turn.
Overdrives: Energy Ray, Energy Blast
Valefor is the only Aeon with two Overdrives. Energy Ray is the default Overdrive, in which Valefor shoots a ray of energy under the enemies, blowing up the ground under them. Energy Blast is a more powerful version with a longer recharge time that can be obtained by talking to a little girl with a pet dog in Besaid. Energy Blast is a lot more useful than Energy Ray. Valefor will attack the enemies with a large energy beam through a spinning disc (often killing the subject).