Very easy way to obtain one of these SOLO in mobile is to first build a large cage containing a revival platform (engram or tribute). Then take a fast flier with an attack/speed pteranodon following. When you find the quetzal you want, whistle the pteranodon to attack and kill the quetzal, then whistle back to neutral. Descend to the dead quetzal, retrieve its implant, and revive it at your platform for a very convenient tame. No need to fire even a single shot at it in the wild. Just be quick to retrieve its implant before something eats it.

More Quetzal Taming & KO Tips