Pokémon Sword and Shield/Rolling Fields

Area 1
This area includes all but the westernmost grass patch.

Area 2
This area includes only the westernmost grass patch. Grass encounters are the same as Area 1, and there are no static encounters, Pokémon in the sky or coming from underground.

Items
You can also find various TinyMushrooms, Honey jars and Poké Balls hidden in flower patches and below trees. As these have many locations and aren't super important items, they won't be individually registered.