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To get anima, you must get all the destruction sphere treasures from the temples, including Zanarkand (impossible to get first time around) Be warned that returning to Besaid village or Macalania temple will require fighting dark Valefor and dark shiva respectively. After this, use the search thing on the airship and find a place called baaj temple. Go there (It is where you went before meeting Rikku) and begin swimming where you fought the green thing which almost ate you. You will have to kill that using Tidus Wakka and Rikku. Swim around there and you will find a temple entrance. Go in and press X at all of the statue things. The door will open and you can get anima.