The Crown Tundra is the second part of Expansion Pass for Pokemon Sword and Shield. The first DLC is named: The Isle of Armor
This is at the same time, the first-ever DLC for Pokemon main series game.
The second area unlocked by your Expansion Pass is the snow-swept realm of the Crown Tundra. See for yourself the beautiful scenery of this shining, silvery landscape! In this frigid area, with its jagged winter mountains, people live in small communities where they support and rely on one another. A man named Peony will appoint you as the leader of his exploration team in the Crown Tundra. You’ll then be tasked with investigating the reaches of this frozen land. And remember the Pokémon Dens that you’ve only been able to glimpse during Max Raid Battles? Well, now you’ll be able to explore their depths! What’s more, it seems a number of previously unseen Legendary Pokémon make the Crown Tundra their home.