Aeons

Aeons are the aid of Spira. They come down to earth once a summoner has prayed to the fayth at that particular temple. But in Final fantasy X, aeons just dont only use a powerful move, they will be able to be controlled just like your own characters. They can also learn many abilities that character have, like life, extract mana etc.

Valefor

Acquired at Besaid temple. Valefor is a flying aeon, so it is best against earth fiends. It has 2 overdrives, Energy ray and Energy blast. Energy ray is already acquired but to get energy blast you have to come back to besaid after going to Zanarkand and talk to the girl with the dog near the temple you will obtain it.(NOTE: No over aeons have two overdrives)

Ifrit

Acquired from Kilika temple. The fire god. A very powerful aeon who is good for your team. He overdive can sometimes break the damagae limit.

Ixion

Acquired in Djose temple. The thunder god. Ixion is a large unicorn who shoots thunder bolts from his horn. Very good against water feinds.

Shiva

Acquired from Macalania temple. The blizzard god. Her opposed GF is ifrit, meaning she is good against fire fiends. Shiva is really a woman made out of ice.

Bahamut

Acquired at Bevelle temple. Bahamut hasnt really got an element. But he is a lot more powerful. His overdirve also breaks the damage limit.

Yojimbo

Acquired at the cavern of stolen fayth, walk inside right to the deep part of the cavern and Lulu's old summoners ghost is there. Defeat her aeon(Yojimbo) and then a teleporter will be on the ground. Use it to teleport the to chamber of fayth. Answer "to defeat the strongest enemies" and then bid. Start with 200,000 then go to 150,000 then 160,000 and 170,000. Accept an offer of about 195,000 to 200,000.

Anima

Acquried at baaj temple. Go there and defeat Geosgano again. Use some stoneproof armour. after beaten go through the door underwater. swim till you get to land. now there is a room of statues. try to push them. If they dont push it means you didn't get the secret item in that temple, so go back to get them.(NOTE:If you didn't get it in Bevelle temple you can never get it again. which means you can't get Anima or the magus sisters, AARRGGHH!!!) so make sure you get the one at bevelle first time. Now go back to Zanarkand temple and there is a new puzzle, you have to find all the white squares. When completed go back to the Baaj temple and touch the eye cblocking the door. Go inside and get Anima.

Magus Sisters

Go to Remiem temple. Belgemine is here, defeat all of her aeons (including Anima and Yojimbo)You will get a Flower scepter. Now go to Mt. Gagazet. Capture all the acquired monsters there. Go back to the monster arena to recieve the blossom crown. Now go back to the temple and go through the door at the back the magus sisters are inside.