You can't get all the materials in the game, but if your trying to create the ultimawepon then you go to a moogle and find the pattern. You can tell what you need by the pattern. Then you go out and kill heartless and nobodies to get what you need. Hope this helps! ;)
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If you're talking about the vending machine heartless, no. Orichalcum plus is only found from treasure chests, the big treasure chests where you throw your keyblade when you open it. But you can get Orichalcum from them, the normal ones.
Only 7 in the whole game: get all types of materials, clear Alantica, clear 100 Acre Woods, treasure in Twilight Town, treasure in The World that Never Was, Treasure in Space Paranoids, clear the Goddess of Fate cup. And no, you can't synthesise and make an orichalcum+, you can only find them and use them to make Ultima Weapon.
There is a new Kingdom Hearts game coming out on the 14th called Birth By Sleep
You beat certain missions or heartless
there isn't any real new game plus