Ice Rock
From Bulbapedia, the community-driven Pokémon encyclopedia.
Ice Rock is a small rock a short way south from Snowpoint City on Route 217 that was originally thought to cause an Eevee trained nearby to evolve into Glaceon; in reality, Eevee need only be leveled up anywhere on Route 217.
Ice Rock is located in an area where the blizzard is very rough, on the easternmost part of the route. It actually appears that the rock is located in the backyard of a house that is near a female Skier. It is surrounded by long grass.
In the anime
The Ice Rock was shown in a flashback in DP076. May and her Eevee discovered the Ice Rock near Snowpoint City. Despite Eevee not having to be leveled up near the Ice Rock, but rather, anywhere on Route 217, May's Eevee needed only to touch the Ice Rock and it promptly evolved into a Glaceon.
