How do you get the ultima wepon on kingdom hearts 2?

Answer 1

First, you have to get the Ultima Weapon recipe from the basement on the way to the room where Sora wakes up after Roxas finds him, then take it to a moogle. You have to have given the moogle every kind of material and have all the ingredients for the weapon. Also, you need the ingredient that halves the amount of an ingredient needed, so you can have all the orichalcum+ ( i think its orichalcum+)