Well, I found this thing kinda funny.

Fight a D. Fossil on the moon.

Use the SNES English version

1)attack with Cecil with the Crystal Sword - 9999 points of damage
2)attack with Rydia with Ice-1, 1 point of damage.

The D. Fossil will then be killed with that 1`point.

YouTube - Final Fantasy II US Battle with D. Fossil SNES