Final Fantasy X Help!

[Ash]

Ok, so i'm currently makin my way through FFX and I think i'm finished...

Oh wait no i'm not, I gotta kill seymour for the third time...

Oh wait no i'm not, I gotta kill that Sanctuary Gaurdian...

Oh wait no i'm not, I gotta kill that thing that looks like evrae...

Oh wait no i'm not, I gotta beat Yunalesca!? :angry:

So basically I need some help on how to beat Yunalesca after the second time you kill her.
I wanna kill the guy who decided "No hang on, it's too easy, lets bring it back to life again."
Cos he used it on almost every boss thats been included in the storyline.

Anyone willing to give me a hand until at least I have to kill another boss again...

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