An Ice Rock is an ice-covered rock that enables Eevee to evolve into Glaceon. If an Eevee is leveled up in an area containing an Ice Rock, it will evolve into Glaceon. Even if Eevee has reached other evolutionary conditions, the Ice Rock will still cause it to evolve into Glaceon rather than Espeon, Umbreon, or Sylveon.
In the games
- In Sinnoh, a small Ice Rock is located a short way south from Snowpoint City on Route 217. It 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 Unova, a large Ice Rock is located in the basement of Twist Mountain, just west of Icirrus City. It is located on the lowest floor, past an NPC who gives the player Fossils of previous regions. Eevee must be leveled up in the room with the Ice Rock in order to evolve into Glaceon; it will not evolve into Glaceon by leveling up anywhere else in Twist Mountain.
- In Kalos, a large Ice Rock is located deep within Frost Cavern. Surf is required to access it.
- In HoennORAS, a large Ice Rock is located on the lowest floor of Shoal Cave, accessible only when the tide is low.
Due to the Ice Rock's absence in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness, Eevee evolves into Glaceon through the use of the Frozen Rock, and the same method in Gates to Infinity.
In the anime
In the Pokémon anime, an Ice Rock was shown in a flashback in A Full Course Tag Battle!. May and her Eevee discovered the Ice Rock near Snowpoint City. Unlike the games, where an Eevee must be leveled up but can be anywhere in the area housing the Ice Rock, May's Eevee promptly evolved into a Glaceon upon touching the Ice Rock.