One of these tombs requires a trainer to have a Pokémon carrying a never-changing stone. This particular tomb is located in the Giant's Bed region. It's closer to the east part of the area, close to where Giant's Foot area. The never-changing stone referenced by the tomb is the Everstone.

Where is the never-changing stone in Pokémon shield?

“Let the first Pokémon hold a never-changing stone.” To solve the puzzle, players will need to open up their bag and have the first Pokémon in the party hold an Everstone. An Everstone stops a Pokémon from evolving only if they are holding it.

What is the never-changing stone in crown tundra?

The never-changing stone in Pokemon Sword and Shield's Crown Tundra expansion is the Everstone. It's an item used to prevent certain Pokemon from evolving.