[animelover32]

Miyavikun: I can't recall who you're talking about unless you're talking about Vegnugun. The best thing I can think of to help is make sure all three girls have protect, reflect, and shell on. It also helps to have one of the girls be a mastered Dark Knight and just keep using Darkness over and over. And have one girl be a White Mage or Alchemist (better if she's an alchemist) to heal the Dark Knight and the other girl. The other girl doesn't matter really. Which ever one she's strongest with.

If it's an aeon, make sure one girl is a mastered Black Mage (especilly if it's Shiva or someone like that), Dark Knight and White Mage/ Alchemist. That's how I usually beat them.

lulu: That part is so annoying...I remember it all to well. What I did to defeat Sin at that part is I just unleashed all my Overdrives on him. And if he still wasn't dead I used my strongest characters, which for me are Auron, Lulu and Wakka or Tidus. If you use Auron (and if Sin isn't immune to them) keep hitting him with Mental, Magic, Armor, and Strength Breaks over and over. That usually helps.