If you are thinking of doing the traditional 2 player argy pickup method then this will help you. Instead of a argy use a high level ptera with at least 2k stamina and make sure it's weight is below half while holding the other person. Pteras are way faster and much better. Me and my friend knocked a lvl 25 quetz out within about 60 seconds using this method and tranq darts.
The fun way is to jump off and grapple to your argie and whistle it to attack and since argies are slow it won’t catch up in time so tranq till it goes out also bring parachutes and consider liking so more people will know
If you drop a quetzal due to knockout, and it lands next to a giga...just know, the quetzal belong to the giga. Now you get to watch your would be quetzal get eaten by a giga. Now you can go home and cry.