If you have a good argentavis grapple yourself to your argent in the air then change from your crossbow to your rifle and begin tranquilizing the when it runs tell your argent to attack target to get closer then passive again when your close enough
I recommend taming this as soon as you get the saddle! They’re a super easy tame, use a crossbow with about 25-80 depending on the level, hop on a pteranodon after shooting it once, land, hop off, shoot it more, rinse and repeat till KO. If you have boosted taming time, just use mejos and it’ll work fine. Up if this helped!