King Mong is Named Enemy in Borderlands 2. He is located in the Eridium Blight region on the Planet Pandora. You have a 66.7% chance of encountering this random spawn in 1 of 2 locations. Occasionally, Donkey Mong will spawn in his place.
You can farm King Mong for the Badaboom as he is the dedicated loot source for this item. King Mong’s legendary item has a 5% drop chance.