Behemoth adobe or better gateways without gates will work to trap a wyvern as a cage. Remember to put a gate on the far side that you'll be entering, pin code it Ave use a smaller dino gateway on the other end and wall off gaps if they are too large. Hook it up to power and a,keypad and you're good to go
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.