Ghostly Pandaren Fisherman

This ghost spawns on the shore of Cattail Lake in the Valley of Four Winds. You have to interact with him, and make sure that you have one slot of bag space. He will give you the Ancient Pandaren Fishing Charm after a short conversation. Once someone has spoken to him, he will despawn, so only one person can get the charm at a time.

Ancient Pandaren Fisherman

As he is an npc, you can add him into NPCscan: his ID is 64004.