IMO the wyvern as it was at XI (mime) would be a waste of time here. Seeing the pace the fights go in this game, hacing an wyvern like FFXI one would certainly means drastic damage nerf to class or a pet so weak that would be pointless to use.

I say this because, as mime pet, it would need the same approach used in FFXI that is DRG + wyvern = non-pet job dps. However, would be nice being able to transform into wyverns or you change to "petmaster" mode where you shift controls between player and pet so there would never have both fighting at same time...this would allow they both to fight with dps even to a non-pet class.