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.)

Bring a friend on a Gallimimus, don't be too afraid, gallies are fast, then have your partner (s) on the back (and/or front) and shoot the thing like it killed your family

You can easily tame these guys by standing in a out of reach cliff or rock and use tranc arrow then feed regular meat but it will take an hour if its lvl 15 above

I can tell you from experience that in fleeing this dino you only need 1 tranq. Yep i shot that thing into my tribemates knee and was able to escape at a brisk pace as the rex ate him