How many orichulum plus are there in kingdom hearts 2

There are 7.
Here's where to find them:
1. Clear Antlantica
2. Clear 100 Acre woods
3 The small chest in The World that Never was, the 'brink of despare', next to the big chest.
4. Clear the Goddess of Fate cup in Olympus Colisium.
5. Chest in Twilight Town. Jump onto the moving train, then go up one of the buildings.
Search until you find it.
6. Chest in Space Paranoid, (the second visit), just before you fight commander spark
and the MCP.
7. Collect all the materials. You will need ALL in the game, (shards, stones, gems
and crystals.)

Hope this helps :)