Well the easiest way to tame this......thing (on mobile) is by Knocking him out in trap of ur chosing and feed him a smoothing balm 10x and it works on any other creature, and u can simply get this (smoothing balm 10x) with a chance to get it, is by Tributing the artifact of the hunter.

take 6 triangle foundations and put them in a hexagon shape and put stone doorframes around it two high and a ramp where you want to lead him in. then for extra protection from glitches you can add another doorframe on every spot besides the ramp spot. grab a flyer and lead him up the ramp and into the trap. have narcotics and berries ready. tranq him and you got him. i got this all from a utube vid but it does indeed work. works good for newer players

Now for a tip and a prayer for my dear korone the sarco

I was going to get metal when out of nowhere this thing started attacking me and when I dies i ran trying to call her to stop fighting it after that it broke my heart and i set my mind to annihilate that sucker so i researched and tried different tactics and i found out that if u manage to use the grappling hook ammo u can hook to a cliff away from it and just pelt it as much as u like as long as you have enough arrows

Theris are incredibly useful tames, they can harvest wood, thatch, berries, meat, hide, fiber and pretty much anything else that isn’t as solid as a rock, as well as this they are as strong as rexes and can run much faster and for far longer, seriously get yourself a theri, you will not regret it

Taming this requires great patience and narcotics. Getting it down is easy if you build a 3x3x3 ramped pen with doors it can’t get out of or tranq it with distance, it destroys armor and can kill you at high levels if you aren’t careful. When it’s down, it will require a few hundred narcotics and half that amount of bio toxin since it’s torpor is double that of narcotics. I can’t find the eggs or the Dino for the kibble so I use crops and starve tame (the best result is to keep it torpored until then hunger is about 1/3 of the full amount: if it’s food is 3600, keep it down until it’s food gets to near 1200, and then start giving it food to allow the bar to go up all the way at once). Keeping it from other predators is difficult but taming bonus or not, they are versatile for gathering and defense.