FFX - Aeons - Valefor

Obtained From
Besaid Island
Special Attack
Sonic Wings - Attack and delay enemy's turn
Energy Ray - Non-elemental damage.
Energy Blast - Greater non-elemental damge.
Initial Abilities
Fire 4 MP Water 4 MP
Thunder 4 MP Blizzard 4 MP
Exceed Damage Limit
Get Yuna's ultimate weapon, Nirvana.

Second Overdrive

To get Valefor's second overdrive, go back to Besaid once Yuna joins your party. Speak with the person behind the counter in the item shop, then go talk to the dog in the hut on the right, closest to the temple. The dog gives you something which allows Valefor to learn the Energy Blast overdrive.