Best unison attack combo ever!
I don't know if this is exactly a "cheat", but by far the best unison attack combo in the game is one called "Prism Stars." Have Genis cast a level three advanced spell, such as Cyclone or Explosion, and make Raine cast Ray. The result is a barrage of 50+ hit combos with holy damage to boot. I am a low level, and this attack already does over 12,000 damage! This also helps getting your max combo counter up to 60 and above.
Added by: Ultima(elite) Jul 21st 2005, ID#4297