There are more than one type of wyvern, they are fire, poison, lightning, and soon to be a Crystal Wyvern with the Crystal Isles free DLC coming, they are going to be a passive tame. The types of Crystal Wyverns are base, tropical, blood, and ember.
The wyverns spawn in wyvern dens, and can be found in the Highlands for Ragnarok and the Snow Desert in Valguero (I only do free DLCs).
You tame wuverns by going into the wyvern dens and finding nests with eggs in them. Once you have an egg, they need 10-15 standing torches, 4-5 fireplaces, or 20 (atleast) campfires. Until they are adults, they need Wyvern Milk to survive. That is all they eat until then.
Wyvern milk can be obtained by knocking out a female wyvern and collecting milk from there. Alpha wyverns drop more than normal wyverns.
Wyverns pick up larger dinos than other flyers.
Wyverns can breathe fire for fire wyvern, lightning for lighting wyvern, and poison balls for poison wyvern.
To get a wyvern egg you would probably need a flyer so it can be a griffin or if its safe and not much wyverns are around you can use an argy tho griffin is recommended once you acquire the wyvern egg you need the new incubator or a bit of air conditioners then a generator or you can ether use torches and campfires i would probably do campfires and torches because its the cheapest and yea but hopefully this comes an handy for stealing wyvern eggs i've done it before and you can not normally tame one you have to get its egg by the way also if you dont know how to get the wyvern milk you can trap a female wyvern and knock it out then go in its inventory or you can knock it out normally and get the milk but it has to be a female or you can use this technique to kill one but maybe dont knock it out since they wake up quickly so be careful and take the advice if you found the den or area and you dont know how to get one i've already done it so hopefully its ok advice for you