Easiest way to tame them is to get a ranged weapon that inflicts torpor(darts, tranq arrows, etc.) get a flying mount, go up on a kill in the swamp, and wait for one to appear. Also works with other cliffs.

Tip once you knock one out, be careful, as I often find more than 1 in a single area

Get it stuck in a rock formation or a cliff or anything else

Once there was a 150 Rex I shot it with tranquilizer arrows and it died

I use a taming raft i tamed a150 rex easily and a giga

Ride on a Dino that you can shoot Trank arrows or darts off of and let it follow you when it starts running then charge it

When you have a Rex agro'd on you lead it to a cliff so I can't hit you but you can hit it

Highly recommend 6 dino gateways. 1 dino gate and 15 stone pillars. Place the gates in a rectangle. One on the left and right, 2 on the top and 2 on the bottom. Like a rectangle. A dino gate on one of the smaller sides of the rectangle and place the stone pillars in the middle of the gateway that does not have a dino gate. And from there. Im pretty sure you can figure out the rest ;3

Trapping it in a pen is ideal for anyone who wants to tame it without any problems so put beds nearby for you or your friends just in case they get killed trying to lure it in, have someone pick up you and your friends so you can tranq it and boom you got yourself a Rex.

Becareful that you don't smoke bud otherwise he might get munchies and die

A good bird can save your life. Movement up your movement speed and stamina on a ptera or argentavis, and you just might live. Or just stand there. That's cool too.

So ive found a lot of rex's either by south zone or where snow meets sand it west. A great way to tame it is get a friend with a bird, have him/her fly you over (bring spyglass to scout levels) then go to town with narco arrows, etc

Easiest way to do this is to get a bird and have it follow you to a steep hill it can't climb and shoot it with tranqs, use a low lvl bow or cross bow, you're going for torpor not damage

Lots spawn in snow biom. If you can't find a high level go on a killing spree to get a new round of spawns, scout the area again, repeat until level you want spawns.

Certainly need more narcs than stated here. Bring at least 28narcs to be safe for lvl 155+

You will need more darts than what it says. I had to use 70+ darts for a level 95

Just boost your movement speed a little. Then youll be able to outrun it. My speeds only about 125 and thats plenty to run turn and shoot a dart or arrow with no drama.

Honestly really not that hard to knock out. Find one on a mountain, fly higher than it can go and land. Shoot it till it's down. If it's a low level it will only take about 20 tranq arrows. I knocked out a level 3 with 12.

App says can destroy stone buildings, we've just tried it and it doesn't work

Spino is better than Rex as it attacks 1.5 times faster and has a high knockback distance