The most easy and effective way I've found to knock out these guys is to get five billboards,and make a square lead it into the square of billboards place the fifth one behind it and boom it's trapped! Tranq it out and these guys love megoberries!!
Eat rare flower and use snow owl and plant species Y trap and quickly place stone gate on its head and body but place them near each other. 3rd one of possible. Do starve taming. It’s when you get its health low and let it recover itself a few times. Ko and feed food with balm.