If you plan to tame the entire pack it's best to have a taming pen. Get a quetz or an argy and lure them over there but be aware that if you fly out of there reach for too long they'll lose agro. So try to stay low and watch out for the alpha's alternate attack. That speed debuff on an argy can be deadly. Once they're in the pen it's pretty straightforward tranq them out using a long neck with darts or a crossbow with tranq arrows and enjoy your pack of allosaurus.
THE best way to tame anything is to use an argy cage, simply use like 5 dinosaur gateways made of stone and keep one gate door open before you find a dino to tame, once you do, lead it to the cage and then run out through one of the gaps between the gateway frames and obviously close the door and, tadaa, one stuck dino to tame