Leveled the Guiding Lands Forest Area to level 5, Zoomaster, and patience. I checked this spot a few times before, but no joy, then got the Mossy Moly variant! Woot!
As you can see from the video and contrary to popular belief, you do not need to leave your Palico behind. Just use your Ghillie Mantle!
MONSTER HUNTER: WORLD™
https://store.playstation.com/#! /en-us/tid=CUSA07713_00