When you have learned how to do the green trinity. Go in the accessory shop and do the trinity. A ladder should drop, then climb up it and you now have access to the item workshop.
in the item workshop
you get the 7th one .. i guess you looking for that one, when you get one item of every item in the game. There are only seven Orichalum + in kingdom hearts :]
The Item will stay there until you leave the room you are in.
In the fist Kingdom Hearts, Cid is located in the Item Shop across from the main square in Traverse Town. He works the register at the Item Shop. In Kingdom Hearts 2, Cid is with Squall (Leon), Aerith, and Yuffie. He is the "tech support" of the group.
First of all, it's Kingdom Hearts, not kingdom hearts. Second of all, it's an item you collect in Kingdom Hearts 358/2 Days in the missions you partake in. It allows you to redo the mission if you wanted to.
It means to mix the items together to make a new item.
It's the last item you get from the Mail Box in Traverse Town.
The Ribbon is an item that is able to be synthesized. You need to add it as one of your character's accessories.
There isn't any item called that way in Birth by Sleep.
*NO SPOILERS*Yes. Many people mistake Kingdom Hearts Birth By Sleep for Kingdom Hearts III. Kingdom Hearts Birth By Sleep is a prequel to the first Kingdom Hearts explaining Sora's past and focusing on three new protagonists: Terra Aqua and Ven. This is commonly referred to as Kingdom Hearts 3, because of the secret video trailer at the end of Kingdom Hearts II. Kingdom Hearts III is not officially started yet, but Tetsuya Nomura has stated in interviews that Kingdom Hearts III will focus on Sora once again, saying that "...Sora will remain the hero until the end." He also said that many more games will come after Kingdom Hearts III, so fear not.
Beat the game and buy the item as following "Kings Return"
Use them with synthesis. Energy materials halve the costs of materials for item synthesis.