The best wyvern to knock out (if you don't have wyvern knock out penn) is female poison wyvern, because the poison projectile can't move as fast as you out fly the wyvern (200 on argent or 240 on tapejar)
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.