First off you take one pet, in ghost form, then you use some special item or method, target a different pet the ghost goes poof, and the "soul" of the ghost pet goes into the body of the targeted pet. Basically, the targeted pet gains all of the stats, skills, control slots, of the old pet, plus a (transmigrated) tag so people don't get tricked. Mountable pets can transmigrate to any other type, but mountable targets can only "accept" the soul of a mountable pet. That way no mountable greater dragons. A simple way to add variety to pets, and lose none of the function. That way we could have "greater" white wyrms, Dread Walrus', Doom chickens... whatever. May have to limit it to pets of a certain size, because a sparrow sized greater dragon might be an issue. Technically, who knows how feasible, but it would be a nice idea anyway. Just an idea.