Wyverns cannot be tamed when wild and must be raise at a 4 day period while in that time you need milk every few hours and the milk spoils within 1 hour and 30 minutes milk is only acquired by killing or knocking out a wild female wyvern or an alpha of any gender. Please note that getting eggs involves angering a large amount of wyverns... minimum argy speed is 185.2 although it's been proven that a 182.4 can out run them.
I got a level 150 lightning egg and I was so excited to hatch the egg...that when I went to put the egg down I accidentally ate it instead. :( ps4 users: R2 ISN'T GONNA DROP THE EGG YOU'RE GONNA EAT IT LIKE ANY OTHER EGG. REMEMBER THIS. LOGIC BEFORE EXCITMENT.