Today, Glaceon are among the least common of Eevee's evolutions, and trainers wishing to raise one outside of the arctic circle make long pilgrimages to the few icy rocks – one in Sinnoh, one in Unova; trainers from Kanto, Johto, or Hoenn must travel much further indeed - capable of inducing this particular evolution. Wild Glaceon are extinct in these lands, although occasionally a feral one is spotted, for none of the rocks are in habitats where wild Eevee can prosper.
Cave paintings from the most recent ice age, however, portray Eevee not as evolving into one of many pokemon, but exclusively into Glaceon, as naturally as a Caterpie becomes a Metapod. The fossil record is not quite so extreme; scattered remains of Eevee's other evolutions have been found, especially in the tropics and the other few areas which avoided the glaciers. But they are so vastly outnumbered by Glaceon remains that the old cave paintings do not appear an unreasonable conclusion for prehistoric Man.
Glaceon, like Mamoswine, were a victim of climate change; the current interglacial has dramatically diminished their global range, and the only humans who train them must use special methods of evolution. Perhaps when the glaciers move again, the Glaceon will return with a vengeance, for Eevee are more popular today than ever. More likely, through global warming or an advanced human engineering effort, the next age of ice and Glaceon will never come. Instead, Glaceon will remain the exclusive preserve of those trainers who seek out the ever-decaying remnants of the glaciers of old in order to evolve their pokemon.
