I'd shout out in Jeuno and you should get help.you don't need a full PT just get a Blm,War(You) and Smn ^^.
I've done it with three people 4 or 5 times with np.You can use Rdm instead of a Blm if he's merited so sleeping the Dragon sticks instead of a BLM.RDM or Blm Sleeps dragon and everyone attacks eye and when eyes about 30%HP Smn 2hr's then Eye dies and Drg takes big hit.I used Ramuh everytime for this also............good luck^^.2 BP should kill him with War and Rdm hammering away also.