The thing I found easiest is to use a distraction dino, such as a few dodos, and just set them in front of you so the agrent will agro on it for a moment. Maybe not long, but it did long enough for me to be able to knock it out
To tame one easy all you have to do is kill something so the argent Avis can eat, and while it’s healing you must knock it out with tranq arrows or darts. If it is knocked out while healing it’ll starve immediately and it’ll tame in seconds no matter what level!
If you lose your argys go to the place that shows your character press the tames button which says how much animals you have, Look for your argys name press request, then wait. It will tp to you, if it’s alive.