Easiest way to tame: make a dino pen, pick one up with an argy, put it in the dino pen then follow along with a basic taming process (knock it out, feed it). Make sure you have lots of narcotics on you!
Best thing about them: they can climb up really steep hills and they can potentially do lots of damage and can be fast.
Where to find: most commonly found on trees (they will be hanging upside down, high up on large trees) in the redwood forest areas (mainly on The Center) or I find lots of them in the Ragnorok desert.
On crystal isles I have crystal wyvern so I just go to desert pick him up and put him in my taming pen made out of stone gateways just make a circle from gateways build a ramp so you can shoot it and you can tame there any dino safely that can be picked up by flyer