Auron takes more damage off enemies when he is low on hp with his celestial weapon. It does help to have the magus sisters...

If you cant find all the celestial weapons just customise your own ones. Lulu is just ridiculously boring to get so i just left it and made her own weapon with the items i got for capturing in each area. i didnt get Tidus' either...i remmember something being really hard and i couldnt do it.

I didnt use a specific team. I swapped round all my characters so they all had their fair share of damage...But most people liked to use Yuna, Auron and whoever else is strong...

So yeah-make sure Auron is low on heath-Yunas ready to summon-everyones equipped with decent weapons-Tidus is ready for the limit break-get ready to cast zombie and curaga-dont forget to talk to Jecht when his bar is almost full and you should be ok...

Not too much ro remmember i hope?