How do you unfreeze regice in Pokemon ranger shadows of almia?

You can't unfreeze Regice in Pokémon Ranger: Shadows of Almia. Regice is a Legendary Pokémon that is permanently frozen in the game's story, and there is no way to thaw it out.

Here's why:

* Storyline: Regice's frozen state is part of the game's narrative. Its frozen form is the result of an ancient conflict and a key element in the story.

* Game Mechanics: The game's mechanics do not allow for thawing frozen Pokémon, even if you capture them.

While you can't unfreeze Regice, you can still interact with it in the game by capturing it. This will allow you to add it to your Ranger team and use its unique abilities in battle.