Whatever you do, do not get close to it with pretty much any medium dinos or fliers because these thing can pick up fricking argies and monch them to death so keep a good distance between them, you and your tames. Trust me on this i lost a lot of things to these monsters.
I’ve actually found the BEST way to tame them! It requires 2-4 stone dino gates and doors and taming food! Trap them inside and let them munch on the doors until they fall unconscious. They won’t wake up, even when night falls, cuz they are out of stamina! No tranqs or narcotics needed!
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