Valefor's second overdrive

You can do this at any point during the game but the best time is to go back to Besaid just after you leave when you first go there. The first thing you have to do is go into the items shop and talk to the person there she will say her dog found something. After your done talking to her go to the house on the right side near the temple and you will find the dog inside press x near it to get Valefor's second overdrive Energy Blast.

You have to do it before dark valefor comes there. When it's to late you can do the overdrive of Yojimbo to kill dark Valefor (I payed 300.000 gil for it)

After you get airship travel to besaid in the village a little girl is in front of temple talk to her and you get the second overdrive

On arrival to Besaid buy a potion or other item and the shop owner (female) will tell you her dog has something funny. - or equivalent go to the top right besaid village tent and speak to the dog using X and you will get the second OVRdrive.

After you go to leave the village head back and go to the item shop, talk with the women and before you finish she will tell you that her dog has found something. At this point find the dog and interact with it to recieve the overdrive. If you fail to do this you have two options....1 travel all the way back by foot before you get past the macalania temple stage OR 2 go back by *spoliers* airship and try to defeat dark valefor in order to find it.

When in Besaid, after Yuna does her summoning, talk to the woman in the shop. She is in the first tent to the left in front of the village. Buy something, then she'll mention her dog found something. The dog is located in the last tent on the right hand side new the temple. Bam, Valero's hidden overdrive. You're welcome.

Valefores second overdrive you can get when the party embarks for the docks after aquiring valfore. Renter the village and speak to the shop keeper she says something about her dog digging up something the other day. You can find the dog in the last hut on the right in the village when you get to the dog it will say he's got something mangled in his mouth. And that's how you get the second overdrive.