Start off by taming low lvl quetz, then put a platform on it. Have buddy fly low lvl quetz with u on platform, along the side of it while u shot it. Make sure to tranq within 10 to 15 sec. Or torpor wI'll deplete.
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 manage to knock a quetzal out, try starve taming. If you never tried starve taming it’s just leaving a Dino’s hunger go to half way or lower and then you start feeding. I’ve done this many times and it’s very useful taming trick.