Praise to my Baryonyx, Steve (named after the baby Alligator at my local zoo) he full on saved me from a lvl 200 carno and same day took out lvl 100 argies and THEN, he topped it off by killing off a lvl 150 griffon, without Steve, I would’ve been dead meat in that area. (He’s lvl 110, he has GREAT attack and stamina, I transferred him over from gen 2)
If you have access to a snow owl, you can tame these with any crossbow! Just shoot it until it looks bloody, and heal it with the snow owl’s ability. Do it so that it heals quite a bit, but not so long that the torpor drains back empty. Then hop off the owl and continue shooting it with tranq arrows. I knocked a 140 with a 279 crossbow and using this method it had over half hp remaining once it finally went down.