For solo taming on ragnarock, step one tame a griffin, then find a Quetzal, then attempt to knock it out with either tranq arrows or darts. Make sure you kite the Quetzal away from any hazards such as the volcano lava or any Dinos that can kill it on the ground.
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.