The best way to steal the Wyvern egg( which you will need to raise the wyvern) is to get a higher level Argentavis, and put AT LEAST 200% movement speed. That's the base speed needed to outrun a wyvern so you can get that egg back to your base safely.
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.