To tame this bad boy is very easy, i will tell you the most easiest way to tame more then one if you want!
1 build a raft
2 build a cage on the raft that is made of stone. Build 6 rock foundations in the front of the raft then build 3 stone roofs for the floor, because this part will hang over the raft then build the three front walls on the on the raft with stone door frames, do not build on the side you drive the raft leave that only 2 door frames high! Then build the ramp to from the low back part then you have completed your portable Trex trap!
3 look for a Rex on the beach or close by
4 then lead the rex in your trap
5 tang it and tame it!
The reason you build the portable trap is you can take it back to base and tame it there so that way you have all your resources in one place to tame it good luck!
I have figured out a new way to tame dinosaurs cut off the dinosaurs meat wise in the area try and keep the dinosaur in the area and send a dodo bird out to attack the tea Rex with bunches of Botox in and it had the tea Rex eat the Botox and it’ll knock it out you go feed it meet make sure you have plenty of Botox in and you’ll have a pet your ex and no I would not recommend trying this whenever your level one side effects may be dead dodo bird hey might find you and run but seriously You better find a good hiding spot
If you use the bear trap strategy which is if you lead it into a Dino gateway that is shaped in a triangle and with a bear trap in the middle (Large Beartrap) and when it is stuck you must put a dinogate behind it to trap it and then knock out. (hope this helped and "If" I win could it be an Xbox voucher, thanks.)