Best way to tame this boi.
First. Get a raft and take it to a swamp or wherever he spawns.
Second. Get 40+ tranq or Toxicant arrows get the raft and have someone else drive it (if solo shoot then drive).
Final. Make sure while you shoot it then have the person drive it near land so it does not get knocked out in water and drown. Then shoot until knocked. Can’t use bolas for this boi so good luck.