Most times the two omega allos will go wherever the alpha is. Key is every few minutes the omega branch off slightly. Distract the omega, kill it. Once the alpha loses alpha status, ko itand kill the other omega
Build 5 stone dinosaurs gateways in a circle with 2 pillars in the middle of each doorway except 1, lead the desired tame through the gates with 1 pillar and as he's stuck, put one on top of the first pillar trapping him.
If you are looking to get an Allo. Go to Lat. 40 Long. 11. They dont always spawn here, so it may take a while. Make a Raft with a wood or stone fountain 2x2 and then make a 1x2 tower that is 3-4 tall. Keep the Allos in the water. I made the mistake of making my tower 2 high. They almost got me. Hope this helps. Like if u Found useful so more ppl will see. =)
Use a tapajara or a quetezl for this and sit above the tame and tranquil it and then kill the others or do the same thing and kill prime animals with the bird or arrows and use the bird to get the prime or a pick and being extra narcotics
The best option for taming these is too have 3 or more at once, lure them into a taming chamber (you can easily make out of wood) then have a ramp going up the side of it to get to the top, shoot them all in the head. Then you're able to tame all 3 at once making you highly dominate.