Good way I've found to get wyvern milk is lure a female wyvern out into the dunes on scorched earth with your own wyvern and shoot the wild one to knock out as it attacks yours(by the way it is quite risky and when I did it my lightning wyvern died and I was so angry with the poison wyvern that did it I forcetamed her and found out she was much better than my last so worth it in that way too👿)
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.