The cave under Viking Bay on Ragnarok you can use wyverns. As soon as night hits, stand on wyvern and shoot the Megalosaurus hop off and run underneath your wyvern. They don't take many darts and won't be able to attack you underneath your wyvern. Easy work!
Tame the mega during the day! It is extremly slower during the day due to wanting a rest. It is a very strong dino, it has been tested to be even stronger than the allo! Be careful if you tame it at night ;) caw