Quote Originally Posted by The Spirit of Aeris
Here's an easy way to defeat Yu Yevon. Get rid of the Pillars first (just attack them) Then cast reflect on your characters and Yu Yevon is now powerless. All he will be able to do is drain your MP. Now just keep attacking him and if the pillars wake up, attack them again then just keep attacking Yu Yevon as before.
...what did that have to do with anything?