Before you attempt to tame one, lemme give you an idea of what one of the easiest ways of knocking a Wyvern out. Make sure you have a argent, with 210+ movement speed to avoid conflict with the wyvern, and have someone else, wether it be a tribemember, or a random friendly help you by being grabbed, and undloading tranq ammo into the wyvern. If you're on your own, then what yoy could also do is have a long narrow platform, at one side, place a keypad, and a wind turbine, and link them up, then proceed to place a behemoth gate at the other end, and link the keypad to the gate. Once you lure the wyvern into the behemoth box you made, close the door with the keypad, and fire away at the now trapped wyvern!

More Wyvern Taming & KO Tips