It bears a resemblance to a mine and has a complex network of caves. The mountain becomes filled with snow in winter, providing easier travel to different areas but also blocking off some tunnels.
The Ice Rock is located in the lowest floor of the mountain, accessible from the central construction site. If an Eevee is leveled up on this floor, it will evolve into Glaceon. Located in the tunnel immediately before the Ice Rock is a Worker who will give the player a random Fossil of the Kanto, Hoenn, or Sinnoh regions once a day after receiving the National Pokédex.