I would suggest bringing 5-10 bolas and a decent health and/or attack creature, and killing all but the one or two highest levels in a pack, then using bolas and taming one. Also bring LOTS of tranqs, took me about 30 hits on a 150 to down it
Bola them first and tranq dart them, anything above lvl 35 will take more than 1 bola lvl 95 and up is going to a struggle if you’ve just spawned in, but great travel mount and great in combat just pump health and melee, stam doesn’t drop that much, similar to a thyla
You won't find anything more useful for keeping these guys still than a small bear trap. You can Bola and kill the other ones if it is in a pack but keep the high level one trapped for knocking out once you've killed it's pack.
The best way to tame these guys in my opinion is to trap them. Make a stone trap with 4 foundations, walls in all sides and a ramp covering one side. It can be one wall high or 2 it doesn’t matter. Then kite it into the trap with a ptera and make catwalks on the outside of the walls and shoot it from there! Hope this helps 😊