you mean that cemetery you come to after beating the dog ghost? if you do then i can help. knock on all the tombstones and a bunch of skeletons will come up. beat all the skeletons and the really big tombstone will start glowing. walk over to it and this really creepy ghost will come up. to beat him, suck on one of those shadowy versions of him until it turns into a ball. shoot the ball at the ghost and start vacuuming!
hope this helps.