To get Primal Crystals, you must knock out a Crystal Wyvern and harvest Primal Crystals off their back. Once you’ve harvested once, it’ll take about an hour for the Crystal Wyvern to "recharge" and allow you to harvest more.
The number of Primal Crystals that you can harvest from a Crystal Wyvern increases with its level. A level 1 produces 2 Crystals, and it increases by 2 at roughly every 7 or 8 levels.
The Crystal Wyvern has an extremely high torpor depletion rate — one of the highest in the game — so it will not remain knocked out for long. You might consider trapping it in a cage so that you can harvest it again later.
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.
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 :( )