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Basically you have to keep fighting in the Battle Square until you reach the required amount of points.
If you get beat during a fight, you will lose the points for that current series - your other points earned will be safe!
So you will be looking at a fair few series of fights to get Omnislash.
After you've gotten 64,000 BP and obtained Omnislash and W-Summon the special battle will be unlocked. If you beat these 8 battles, with Proud Clod as the last enemy (can be easily taken down with Knights of the Round), you will get the Final Attack materia. If you keep beating that battle, you will get various useless items, such as Autograph, Combat Diary and Masamune Blade.
Hope this helps.
- S
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