Where can I get the “ultima weapon” in the game Kingdom Hearts 1?
The Ultima Weapon is Sora’s best keyblade and can only be earned through the synthesis process at the Moogle synthesis shop in Traverse Town (just above the accessories shop where you first meet Cid.) You have to have synthesized most of the other items first and unlocked the list of the most powerful items. Then you need 5 Lucid Gem, 5 Power Gem, 5 Thunder Gem, 3 Mystery Goo and 3 Gale.