How do you get the ultimante keyblade in Kingdom Hearts 2?

Answer 1

You can get its recipe about the end of the game. When you go to twilight town to the old mansion where you fix the computer enter Roxases town (just go through the portal) and from there go to the place where you fought Axel with Roxas. From there go to the room where those pads are and between Goofys and Donalds pad there is the Ultima recipe. But its actually hard to make because you'll need 7 Orachilum+ -_-" Well good luck anyway :)