How do you gather items for Ultima weapon in Kingdom Hearts2?

Answer 1

just get all the items from all the different world but sererophth the guy with a wing

would have either a oriculam+ or a serenity crystal but you need 7 oriculam+ not 13

1 dense crystal, 1 mythrill crystal, 7 serenity crystals, the serenity crystals you can get from sorcerers assassins samurai one oriculam is in a box get on a tram train in the first world you start at go to the train station and get on the train that is not purple then get on the tram car you will see it on a building's top, then clear all the places you can get too other then the very last world ok, and excuse me for my spelling OK! *cough* lets get this straight

7 oriculam+

7 serenity crystals

1 dense crystal and mythrill crystal and a regular oriclum ok!

Answer 2

The items for the Ultima weapon are gradually obtained whilst progressing through the main story, and are obtained mostly at random. Twilight and Dense items are needed, but can be found rather frequently later on in the game. The rarest items you will need is Orichalcum, and Orichalcum+. Orichalcum is found through many different means, such as treasures, rare Heartless, and Bulky Vendors, etc., whereas Orichalcum+ is only found through bosses, and treasures. If you are one Orichalcum+ short of crafting an Ultima Weapon, try fighting the optional-boss, Sephiroth, at Radient Garden. He drops one as well.

Remember, you can't make an Ultima Weapon at the start of the game. It is a very special weapon, and takes a long time to acquire the numerous synthesis materials needed to synthesize it. Good luck!