How do you get a frozen rock in mystery dungeon explorers of sky?

In "Pokémon Mystery Dungeon: Explorers of Sky," you can obtain a Frozen Rock by visiting the dungeon known as the "Frosty Forest." Inside, you need to defeat certain Ice-type Pokémon, such as Snorunt or Glalie, which may drop the Frozen Rock upon defeat. Additionally, you can find it in treasure chests or as a reward for completing specific missions. Make sure to explore thoroughly and defeat Ice-type enemies to increase your chances of obtaining one.