While this strategy doesn't really help much for getting an egg. For wyvern milk you could put a ballista turret on a parasaur saddle load a chain bola which does effect wyverns. Then use a fast argy to agro a female wyvern and lead it to the parasaur and down it for milk harvest. Then repeat until you have enough milk to raise your wyvern.
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.