If you want to tame a wyvern, read this:

#1: Get a flyer that has good health, speed, and stamina. (I recommend a pteranodon or griffin for speed or bat for near invisibility at night)

#2: Fly to the Wyvern Trench and land outside of it to regain stamina. But be careful of the wyverns inside.

#3: Drop as much gear as possible before you go in because wyvern eggs weigh a lot.

#4: Get the first egg you see. If you can't find one, leave because the wyverns could kill you. After a bit, you can go back in. (Force new egg spawns by killing nearby dinos or killing wyverns if that doesn't work)

#5: Once you find an egg and grab it, fly out as fast as you can. If wyverns come out of the trench farther than excpected, fly next to a bronto or anything big so the wyverns will attack it instead. (I'd say before you grab the egg, turn your flyer around so you don't waste time turning around after you grab it)

#6: If you escaped successfully, get to your base and place 15-20 torches because wyverns need extreme heat to hatch. Egg Incubators and campfires also work.

#7: Wait a few days for the egg to hatch. Egg Incubators make it take only 30 minutes.

#8: Before the egg hatches, find some female wyverns and milk them by knocking them out because wyverns only eat Wyvern Milk until adulthood.

#9: Once the egg hatches, claim the baby by naming it. Then immediately start feeding it Wyvern Milk. (If the baby won't eat the milk and you're panicking, force feed it the milk)

#10: The maturation will take days but Egg Incubators make it a day and a half.

#11: When the maturation bar is around halfway full of almost full, the wyvern will want either to walk with you, be hand fed, or cuddle, by having a sign above name. I highly recommend do this because it will give 100% imprint. (For example, the pacifier sign means it wants to be hand fed)

#12: Once the taming bar meets 100%, you can finally ride on the wyvern and it doesn't take Wyvern Milk anymore and instead eats meat. (They eat all kinds)

Name tip: If you have a male lightning wyvern, name or Thor or Zeus