Getting Anima Guide
In Final Fantasy 10 Anima is by far one of the more difficult Aeons to come across, to get Anima first you should enter the Baaj Temple and using the Airship, the co-ordinates are:
X 11-16 and Y 57-63. Once you enter the Baaj area you must first fight Geosgaeno, he likes to Petrify - once a character is Pretified they sink to the bottom of the area and cannot come back for that battle so it is recommended that you have as many Stoneproof items equipped as possible.
Once you find Anima's 'Chamber of the Fayth' you will immediately notice it is different, instead of your average chamber this one has Six Statues, you must light up all the statues to access the Cloister.
The way to light up the statues is to use the 'Destruction Sphere' in every previous Chamber of the Fayth to get the special item. At this point you do not need the item, just to have used the Destruction Sphere in every temple at some point.
If you have not done this for every Chamber you must revisit them. Do not worry, if you missed out the Bevelle D. Sphere it does not matter, because you cannot re-enter the Bevelle Chamber.
After solving the puzzle return to Baaj Temple and enter the Chamber of the Fayth, a short cutscene of Seymour's mother being Anima and why Seymour is so corrupt will appear - after this you will then have this awesomely powerful Aeon under your control!