Ultimate Weapons

Here is a list of where to find everything.

Tidus

Weapon - Top Sector of Calm Lands, in a tiny little path, must beat Chocobo Trainer to obtain.

Crest - Area where you fight Yunalesca

Sigil - Get time of 0:00 on Chocobo Race

Yuna

Weapon - Monster Arena, catch one of every fiend in Calm Lands

Crest - Besaid, in small alcove in water where you first meet Wakka

Sigil - Defeat all of Belgemines Aeons

Wakka

Weapon - Win 5 Blitzball matches, talk to Bartender in Bar at Luca

Crest - Locker in Aurochs locker room

Sigil - Random Blitzball Prize

Auron

Weapon - Put Rusty Sword into Statue on road near the command center

Crest - Oldroad, very beginning

Sigil - Unlock 10 Area/Species Creations in Monster Arena

Rikku

Weapon - Enter password "GODHAND" into Airship

Crest - Sand trap in Sanubia Sands

Sigil - Do Cactuar minigame in Sanubia Sands, in Sandstorm area

Lulu

Weapon - Outside of Baaj Temple, keep pressing X as Chest is hidden

Crest - Farplane, return a second time

Sigil - Dodge 200 Lightning Bolts consecutively, outside of travel agency

Kimahri

Weapon - Pray to 3 Qactuar Stones in Thunder Planes

Crest - Entrance to Gagazet, near pillar

Sigil - Defeat Butterfly Minigame

To obtain any of the Weapons, you must have the Celestial Mirror, which is obtained by...

Beat Chocobo in race at Remiem Temple. Obtain Cloudy Mirror. Go to Macalania Forest. Talk to mother/son multiple times, then go right to find the father, go back, talk multiple times, then go up the Shiny Path, to find son, he will upgrade mirror to Celestial. This is also where you will upgrade all of the weapons with crests/sigils.