How do you get the ultama weapon on Kingdom Hearts 2?

Answer 1

The Ultimate Recipe is found in a chest at the Mansion: Basement Corridor. The Ultima Weapon is a rank S synthesis item that provides 119 EXP. An Energy Crystal is required to reduce the Orichalcum+ required for synthesis, as there are only 7 in the game; this means that the Ultima Recipe cannot be synthesized unless the Moogles are at least level 2. As Serenity items are part of the recipe, they cannot be used to upgrade it.

• 13 Orichalcum+
• 1 Orichalcum
• 1 Mythril Crystal
• 1 Dense Crystal
• 1 Twilight Crystal
• 7 Serenity Crystal

I got this from: http://kingdomhearts.wikia.com/wiki/Ultima_Weapon#Kingdom_Hearts_II

Please help yourself to anything this is a great website for help if you dont know what to do on any Kingdom Hearts game.