This is my strategy for beating the last 3 bosses in FF7. I used this strategy myself and beat Bizzarro Sephiroth in 3 minutes, and Savior Sephiroth in 13 minutes!!!! Okay, here it goes. First of all you need A LOT of money(i'd suggest using a gameshark for the money code). Next, equip 2 of your party members with the "coin" ability. While fighting, have your "coin people" use coin, and the other attack or heal. Believe me, this works, I was taking 30,000 hp away a round.