Have Barret in your party with Fury on. The Midgar Zolom will give him a Limit Break in one hit. Have Barret on the bottom of your menu and all characters in the back row. Use the other characters to heal and use Barret's first Limit Break as Mindblow. This will zap the Zolom's magic, away rendering Beta useless. Also, if your characters have Sadness level 26, Zolom will only do 900 damage at maximum with Beta. Beta is also an Enemy Skill. Zap his energy, use Bio, and defeat him.