Frost Cavern

Frost Cavern (Japanese: フロストケイブ Frost Cave) is a cave located in the Kalos region to the north of Dendemille Town.

Located in a first-floor room accessible via stairs at the northwest end of the second floor of this cave is an Ice Rock, which will allow undefineds to evolve their into. On the upper level of the first floor, a female will fully heal the undefined's Pokémon if she's talked to.

3F

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In the anime
The Frost Cavern appeared in Over the Mountain of Snow!. tried to get shelter there, but were attacked and subsequently blasted off by an angry. and soon arrived at the same location, and discovered that Abomasnow was merely trying to protect a sick  inside the cave. The group then proceeded to split up into pairs in order to find ingredients for a medicine needed to cure Snover. Ash and ventured deeper into the Frost Cavern to find Spring Moss, while  and  explored its surrounding areas for Mountain Marigolds. When the two medical plants had been found, Clemont was able to mix them into a medicine that cured Snover.

The cavern appeared again in Till We Compete Again!, where Alain and Mairin visited it as a part of their Mega Stone research for Professor Sycamore.

The interior of the cavern is made of dark-blue ice as opposed to white ice from the games. The cavern also houses a hot spring at one of its deepest parts.

Trivia

 * On the player's birthday, a special kind of weather known as will be in effect outside of the cavern.

In other languages
Frosthöhle Gruta Helada Caverne Gelée (Kalos) Caverna Gelata フロストケイブ 冰结洞窟