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 :]
No. You only receive the Hades Cup Trophy.
The boss is in the Bizzare Room.
You just find them in the big treasure chests around worlds.
I guess you mean what games there are. They (so far) are Kingdom Hearts I, Kingdom Hearts II, Kingdom Hearts 358/2 Days, Kingdom Hearts Chain of Memories, Kingdom Hearts Re: Chain of Memories, Kingdom Hearts Coded, Kingdom Hearts Re: Coded and Kingdom Hearts Birth By Sleep (plus some Final Mixes, for some). Next is Dream Drop Distance, for the Nintendo 3DS.
There is a new Kingdom Hearts game coming out on the 14th called Birth By Sleep
in day 255 one of the three mission
Kingdom Hearts Final Mix and Kingdom Hearts II Final Mix+ are Japan-excusive games and are not scheduled to be released in the US.
No i think that is on kingdom hearts 2 final mix plus but that one is in Japanese
just complete the game and u will end up with about 3
as of now, no
No.
Orichalcum + is found in the Central Computer Messa in Space Paranoids, Sunset Tearrace in Twilight Town, The Brink of Despair in The World That Never was, you have to finish Starry Hill in the 100 acre wood, finish "A New Day Is Dawning" in Atlantica and finally finish the Goddess of Fate Cup.