If your on disc 3 and you cant beat the Silver Dragon,Garland and Kuja trio all you need to do is this... have all your party members at around level 40 and have Vivi,Zidane,Steiner and Dagger have Vivi keep using Thundaga,Firaga or Flare.
Have Steiner using Thundaga sword,Firaga sword or Flare sword,have Dagger keep using Bahamut and at times Leviathon and have Zidane use Steal or Hi potions.
(also have most people with Auto potion, Auto Regen, Auto Haste and Auto Life DEFINATELY NOT Auto Reflect or Kuja will use Flare Star and have Dagger equip Pumice piece so she knows boost!!!!!
And last but not least how do you get a Pumice apart from beating Ozma
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