This might be a harder way but I’ve tamed two rexs so far with this method, one died though and as I was taking another it was eaten by sharks cuz it went in the water but I’m taking one right now. So the tip is to get in a griffin get out ur longneck and go ham on that baby. Griffins move left and right to do you can almaanis manouver around and keep hitting him. You never get touched and if the rex starts running away just use the birds speed
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.)
You can use the normal darts or arrows. But the fastest way to tame a Rex .
Get under its belly as fast as you can and rub its belly, instant tame :) all you new player try it out and you'll be riding like a king like us vets !!
Create a 3x3 mobile taming pen 3 walls high on a raft with a Dino gateway on one side and ramps on the other. Use a flyer to lead it up the ramp into the pen then move it to a safe area to tame. I got 2 150s without a single issue.