omnislash really simple
Get 99 of basically every item you can think of, especially x-potions and antidotes, after that, get vincent to level 60, have him wearing the mime, and knights of the round materia, now enter the battle arena with him. Don't use K.O.t.R just yet, use it at about the 3-4 round, then use mime over and over, when you get to the 7th round, use his limit breaker(you should have gotten it during those battles) sometimes you'll break your command or summon materia, which sucks, but still use his limit breaker, you should survive, I did it about 15 times getting about 8k BP each time I went 8 rounds.
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