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Cloud's ultimate weapon is called Ultima Weapon. You can gain it by defeating the optional boss Ultimate WEAPON after the first visit to the Northern Crater (disc two, from memory). The first time you fight him is a storyline battle above Mideel, but afterwards get in the Highwind and fly around looking for Ultimate WEAPON. He'll be flying around the Junon Crater. Fly into him and defeat the WEAPON, then chase him and fight him again and again etc. Eventually you'll end up fighting him atop Cosmo Canyon. After this battle you'll be rewarded with Ultima Weapon. -- Emperor-PSPField Borghen LeonDK 13:07, November 20, 2013 (UTC)