Aeons

Characters

Legendary Weapons

  The sinspawn absorbs any magic cast at Sin, so take it
out first. Cast Slow and Silence on Genais.
By casting Silence, you can prevent it from casting Cura.

  Once Genais crumbles, the group advances on Sin's weak
point. Physical attacks won't inflit much damage until
you use Armor Break. If Rikku or Kimarhi has the
Copycat ability, you can switch them into the fight.
Have Lulu Doublecast Flare or Ultima, depending on her
remaining MP. Then have Yuna cast Holy, and make the
third person in your party Copycat Holy if possible.

  Bring in Rikku to heal and cure Venom status with
Al Bhed Potions as needed, and focus Yuna on casting
Holy or summoning. Again, avoid using your characters'
Overdrives during this battle. You will need them to
survive the next encounter.