Anima is the second of three option Aeons that you can obtain within Final Fantasy X. Anima can be obtained by completing Baaj Temple.

Baaj Temple is a hidden location that can be found by using the search command while looking at the world map on the Airship. Check out the Airship Passwords and Hidden Coordinates section for more information on where to find Baaj Temple as well as several other hidden areas.

The entrance to Baaj Temple
The Glyph blocking the entrance to Baaj Temple

Check out the Baaj Temple side quest section for more information on how to obtain Anima.

Baaj Temple