Tropical wyverns spawn near the beach and have a water buff, like the spino, blood wyverns spawn in the forest that has red trees and also the red trees can give charcoal and blood wyverns can drain life from other creatures/ tames/ people and give your blood wyvern health if it is hurt at all. Ember crystal wyverns just breathe fire, blood and ember crystal wyverns are better for pvp. I recommend, if you have it, use the bone wyvern skin so they can’t tell what type of crystal wyvern it is. Good luck on taming them! (I play on Xbox so I can’t tame them :( )
TRANFERRING IS POSSIBLE! I uploaded all 3 of my passive tamed crystal wyverns into the obelisk & transferred them to Ragnarok & The Island w no issue whatsoever. I didn’t try cryopod transfer, as doing that makes me nervous & I don’t like to risk it. But transferring through the obelisk works.