Back when Kabutops roamed the land and Omastar the seas, Togekiss and Aerodactyl are known to have filled the skies, like Pidgeotto and Fearow today. Sixty-five million years ago, a large meteor struck the planet, and no Togekiss would be seen again for millions of years. Today, they are still extraordinarily rare, having been well-adapted for a niche which no longer exists. And yet their eggs survived.
Togepi, which do not fully shed their eggshell until completing evolution, have the remarkable ability to determine the time of their own hatching, even at the expense of waiting an eternity. They are an extremely cautious pokemon in this regard, requiring abundant food and often even a willing and capable caretaker before hatching. And so throughout the ages, a small but steady trickle of Togepi have continued to hatch. Most died young, their "mothers" outraged by the strange creatures, their bodies designed to hunt insects which no longer existed. A few found an acceptable diet, lived long lives, and occasionally even reproduced, but very few of their bloodlines grew sufficient in number to be more than a drop in the enormous bucket of ancient, unhatched Togekiss eggs.
To this day, functioning Togepi eggs are found near fossils, and often taken home to be raised by paleontologists. Once they hatch, they are fairly unremarkable creatures, walking around with half their eggshell on as if unsure whether or not conditions are ripe for evolution, notable only for their usage as good luck charms and a lower incidence of mood disorders for their trainers. Interestingly, some Togepi have outlived generations of trainers before concluding that it was time to evolve; it seems that the half-hatching performed by Togepi does not completely remove the remarkable power of their eggs.
