another thing: i'm not sure where you would have last saved, therefore whether or not this is of any use. but it's vital to always have all your players at an overdrive before any boss battle, this one being no exception. also, seymour casts his elemental spells in a certain order; i think it's ice>lightning>water>fire. this means that, before he casts, you can have Yuna cast the appropriate "Nul" spell; don't underestimate Yuna's usefulness. in battles like this, she's invaluable. Other than that, i'd say keep an aeon up for all of Anima. He can't kill them with Pain, so that should do you well. good luck, post again if you still can't get him.