Glalie

Glalie is a spherical Pokémon that consists of a black rock core covered by ice. The icy covering has several holes and spaces across this Pokémon's body. Blue eyes and a mouth with flat teeth are visible through three of these holes. There are two large, black, conical horns on either side of Glalie's head.
Mega Glalie's jaw is dislocated because of the overwhelming energy, causing its mouth to extend to the length of its face. The lower jaw is all black except for two light-blue, conical, icy spikes. The pupils in Mega Glalie's eyes are now red instead of black. The horns on top Mega Glalie's head have been partially turned into ice, with the addition of a third horn on its forehead.
There is a legend that says Glalie was born from a boulder that has absorbed the distress and regrets from any mountaineers that got lost on icy mountains. Glalie's icy body is actually rock that is not particularly hard. When covered in ice, its body becomes harder than steel. It does not melt, and it can control ice by instantly freezing moisture in the air into any desirable shape. This ability is used to drape itself in ice armor and freeze its prey, which it then consumes whole. It prefers consuming Pokémon like Vanillite that are already frozen though. It can be found in caves, particularly when the outside weather lacks snow.
Mega Glalie can spill endless blizzards from its broken mouth, though it gets irritated by the fact that it can no longer consume its prey. The areas Mega Glalie often appears in, will cause the area to be whited out. Any prey that it envelopes within its mouth is frozen instantly.