Cloud: Ultima Weapon To get this weapon, you must defeat the Ultimate weapon. To do so, you must keep fighting it until it hovers over Cosmo Canyon. Then you will be able to defeat it once and for all! It's death will also cause a crater, which will allow you to reach the secret forest!
Aeris: Princess Guard You must find this weapon at the Temple of Ancients.
Tifa: Premium Heart Well, you need to go to the abandoned item shop at wall market. First, however, you need to find the Sector 5 Key at Bone village, it is a normal treasure. Well, don't try to get more stuff out of the machine, or else you'll just get a near death experience.
Barret: Missing Score To get this weapon, when you are in the sister ray to go fight Hojo, you must have Barret in your party. The Missing Score will be lying on the ground.
Cid: Venus Gospel In disk 3, there is an old man standing in front of the item shop in rocket town. He will talk about the rocket, talk to him enough times, and he'll give you the venus Gospel.
Cait Sith: HP Shout When you go back to the Shinra HQ in disk 2 or 3 whichever one it is when you have to go to the sister ray, go back to where the lockers were, look inside all of the lockers, Cait Sith's HP Shout will be there.
Vincent: Death Penalty To get this, you must revisit Lucrecia's Cave/Vincent's Waterfall in disk 3, it will be there along with his ultimate limit break Chaos.
Yuffie: Conformer You will find this weapon in the downed Shinra plane. If you stay to the west when you are underwater, you will find a crevice. Go in the crevice and you will come upon the Shinra plane. The Conformer is located in the first door to your right. It is in a treasure box toward the top left?
Red XIII: Limited Moon To get this, you must go to Cosmo Canyon and talk to the man that lives with Bugenhagen. He will tell you that Bugenhagen is sick. Then Red XIII will get worried. You will be around the fire. Red XIII will later rejoin you around the fire. Then he will have the Limited moon.