Which Came First, The Chicken or The Egg?

Personally, I think it's the egg, but that's not what I'm here to discuss. Today's Pokemon is based on the prehistoric pteradactyl (Or other related species), commonly and inaccurately referred to by most as a "dinosaur". In actuality, flying reptiles like the pteradactyl are not considered true dinosaurs, simply because they fly (One condition for being classified as a dinosaur is to be terrestrial aka land-based). Without further ado, here comes the winged claw:
Pokemon: Aerodactyl
Ability: Atheist
Atheist is an ability that allows the user to revert any object to its original form. The phrase "original form" can refer to whatever the object was like before it underwent a certain process. The simplest of ways this ability can be used is to remove damage from an object or person by reverting it back to what it was before being damaged. Atheist ignores the conservation of mass so it is entirely possible to transform a piece of paper into a log (Although this takes considerably more energy than simply obeying the law), or even turning a bird into a dinosaur (By taking advantage of the definition of "original form", the user can revert a living being to whatever form it might have taken before undergoing the process of evolution). In regards to that last application, it would appear as though Atheist will not work on any being that shares the user's species. Simply put, Atheist doesn't work on humans (Unless the user just so happens to be a chicken). Aerodactyl is a paleontology nut who loves seeing prehistoric creatures alive and kicking (The problem lies in how long he can keep them alive, due to living conditions being vastly different back prehistoric times. Meganeura (Giant dragonflies) would not be able to live for too long in the current world due to the reduced oxygen content in the air, for example). He is also somewhat temperamental and will not tolerate being called a freak or anything else that sounds demeaning to him.