Recently tamed my first crystal wyvern. Went to a premise trap, tranq’d an heir, took the crystal from its head, ran to despair it from the trap and repeated one more time to acquire enough prime crystal.

Turned to the tropical beach, Brought a crossbow and a grapple hook. Waited for the wyvern to land, jumped on its wing then shot it between the shoulder blades with the grapple hook. I’m on console so I pressed left trigger to give the grapple some slack in case I fell off and was able to feed it all the crystal needed.

Once it tames, I just pressed ‘y’ to ride it and left the area.

Hope this helps!