From the Ultimate Weapons Guide at
www.gamefaqs.com:
Quote:
You'll notice that your ultimate weapons aren't all they're cracked up to be
at first. In fact, you can't remodel them, and they prevent you from gaining
AP! Their powers are sealed, so you'll need to unseal them to take advantage
of their full potentional.
Each weapon has 2 power-ups, a Crest and a Sigil. After collecting each power-
up, return to the plant in Macalania Woods to unseal your weapons. Without
unsealing your weapons at all, they will only bear the [No AP] auto-ability.
After unsealing them with the Crest, they will bear [No AP] and [Double
Overdrive]. And finally, after unsealing them with the Sigil, they'll have all
of the bells and whistles they rightfully should have. Also, you cannot unseal
your weapons with the Sigil before you've unsealed them with the Crest. If you
have both in your inventory, you still need to talk to the plant twice - once
to unseal the weapon with the Crest, and once again to unseal it with the Sigil.
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After unsealing the ultimate weapons with both the Crest and the Sigil, they will all have the properties Break Damage Limit (possible to do more than 9999 damage) and Triple Overdrive. They will also have 2 more properties each, that vary. Some have Double AP, but not all, for example.
Each weapon has it's separate Sigil and Crest. Tidus' ultimate weapon has the Sun Crest and the Sun Sigil for example.