Crystal wyvern easy passive tame. If server allows, run onto its back between the shoulders and feed it crystal in your last slot with [e]. On it's shoulders it will be less likely to drop you. Carry food and drink, have a flyer on follow if you can, and parachutes just in case.
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.