Duoed it as PLD/WAR with my WAR/MNK friend, just bring some OJ, take out the eye first, then take the dragon out. Siimple as that, pushover fight. Or you can always solo it as a DRG/RDM :

http://www.youtube.com/watch?v=GjekGdM5MM8

Basically its take eye out first to prevent magic, and fight dragon afterwards. Its really easy.