Knocking out your first quetzal and you don't have a quetzal to help? Have a tribemember hold you with a pteranodon and fly in front and above the quetzal and have the person being held tranq it repeat until down
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
In order to solo tame a quetz, you could use an argentavis and a pulmiscorpius. Just pick up the pulmiscorpius, and do whistle attack target while looking at the quetz, your pulmiscorpius should start attacking the quetz, raising it's torpidity until it is knocked out.
Switching seats on a Tap and doesn’t work on mobile. I just grappled onto a argy and shot it out of the air. Don’t deploy a parachute beforehand though because it takes forever to get to the ground. Release the grapple, then deploy the parachute. I learned that the hard way.