Deep Ice Cavern

The deep ice cavern is a location far underneath the cave area of the battle isle.It houses the Black Ice Beast which is a very powerful dark ice type pokemon. In this area you can find many pokemon you cannot find anywhere else. For example regice can be found here(regirock is in the upper cave) aswell as alolan sandslash, alolan ninetails, and beartic. These are just a few examples of the pokemon you can find here.