Easy tame: Hit level 65, grab 100 crystal and run to a wyvern, from my experience 100 crystal is enough for every level, next, climb onto the wyverns wing and onto its back (its very hard to do but is neccessary) then hit X and prone, lastly feed it a crystal... the time between the first and second feed can be up to 10-30 minutes but usually not that high, all the rest of the feeds will be within a minute of each other