Diamond in the Regi.
Nintendo / The Pokémon Company
The latest Pokémon Sword and Shield DLC, The Crown Tundra, is all about catching Legendary Pokémon.
Regice, an Ice-type Legendary that originally appeared in the Hoenn region also returns, along with other "Regi" Pokémon like Registeel and Regirock.
To catch Regice, first head to Snowslide Slope, where you'll find the Legendary Pokémon's temple. You can get there by taking a sharp left immediately after entering Giant’s Bed from Frostpoint field.
On your way, make sure to catch a Cryogonal. You’ll need it. They can be found throughout the Crown Tundra, so you’ll definitely spot one roaming around.
Upon reaching the Snowslide Slope, you’ll see a forked path. Take the left one to find the Regice temple.
You'll find the temple at the path's end. Interact with the temple door to receive a riddle: “Walk together with a living crystal of snow.”
Make Cryogonal the first Pokémon in your party so they follow you. Once that’s done, interact with the door again.
Once inside, run across the seven circles on the ground so they all light up at once.
Now it’s time to fight and capture Regice. They’re weak against Fighting-, Rock-, Steel-, and Fire-type attacks.
Dusk and Heavy balls are the best to capture them.
If you accidentally kill Regice, don’t worry. Light up the floor and interact with the statue again to retry the battle
Now it’s time to catch the other Regis.