One way to get a good wyvern if you don’t have the creatures to search the wyvern trench for hours on end to find a high lvl is to steal the fist egg you see, if you are a server owner or are on single player, raise the growth rate so it grows up before starving, on official you can use daeodons to keep the baby alive. Once the wyvern grows up you now have a faster and tankier flyer than a pteranodon to steal the eggs with and get a good lvl.