Cloud - Ultima Weapon

     Cloud can obtain his ultimate weapon, the Ultima Weapon, by destroying the Ultimate WEAPON.
     Confused? On Disc 3 you can find Ultimate WEAPON hovering over a lake in the eastern
     continent.

Barret - Missing Score

     Barret's ultimate weapon, the Missing Score,can be found on the steps that lead up to the Sister Ray
     just before the team encounters Hojo.

Tifa - Premium Heart

     After getting the "Key to Sector 5," you can return to the wall market and check the broken vending
     machine again. It's fixed, sort of. It dispenses Tifa's ultimate weapon, the Premium Heart, and then
     breaks down again.

Aeris - Princess Guard

     While wandering around the Temple of Ancients, you'll find Aeris' ultimate weapon, the Princess
     Guard, just off the clock room. It's at the end of the IV hallway.

Red XIII - Limited Moon

     After taking Bugenhagen to the Ancient City, return to Cosmo Canyon with Red XIII in your party.
     He finds Bugenhagen in pretty bad shape, but Red XIII walks away with his ultimate weapon, the
     Limited Moon.

Cait Sith - HP Shout

     During the team's second raid on Shinra's headquarters, you can pick up Cait Sith's ultimate
     weapon, the HP Shout, from a locker in the health spa located on the 64th floor. The locker is on
     the left side of the third row.

Yuffie - Conformer

     When you have the submarine, locate the crashed Gelnika just off the coast by the Gold Saucer.
     Inside the generator room is Yuffie's ultimate weapon, the Conformer.

Vincent - Death Penalty

     After acquiring the submarine or a Gold Chocobo, you can reach Lucrecia's Cave, located behind a
     waterfall in a lagoon in the Nibel area. Visit the cave with Vincent in your party during Disc 2. Then
     during Disc 3, revisit the cave with Vincent in your party to get his ultimate weapon, Death Penalty.