Originally Posted by DamagedWill
The Opportunity spot worked for me too. I'd say about an hour of trying. It felt so damn good to see that bastard show up. Now I just need to find that damn Chubby and Donkey Mong.
Yeah Donkey Mong appears under Mal's/Entrance to Ore Chasm, but he will only appear if King Mong isn't there when you come in the area and you cleared everyone out around his area.