This article is from the Final-Fantasy and other Square Soft Games FAQ, by email@example.com (Nick Zitzmann) with numerous contributions by others.
During the final series of battles, you can steal an Atma Weapon and
Ragnarok Sword from the goddesses which fight the party before the final
showdown with Kefka.
Once you get through the entire dialogue with Kefka at the end of
Kefka's Tower, you'll fight the modified versions of the goddesses.
Fight through the first two scenes, and make sure that Locke is in your
party. In the third scene, have Locke steal from the two targets. They
should have a Ragnarok Sword and an Atma Weapon. Have you ever wanted to
try equipping a character with the Genji Glove, Offering, and two Atma
Weapons? Now you can!