The game apparently has no dungeons... From Eurogamer's review.
"the lack of a National Pokédex is not the problem. The real problem with Pokémon Sword and Shield lies much deeper, or rather where that depth ought to be. There is far more than a whiff of troubled development to these games, brought about by an astonishing lack of complexity, texture, and flavour in almost every place where you'd usually find it in every Pokémon game that's come before you'll reach an entrance to the next section, bathed in some mysterious, eerie glow and - oh! - it's not the deeper, inner level beneath the surface; it's the next town, and the end of this place you expected to be a dungeon altogether. This happens time and time againIn fact, Pokémon Sword and Shield is entirely dungeonless. There is no route or cave or building or wood more complex than Red, Blue and Yellow's Viridian Forest, the tutorial pseudo-dungeon at the start of generation one. Nothing in the game comes close to even Mt. Moon or Rock Tunnel, let alone the twelve floors of warp-pad mayhem in Silph Co."
