Obsidian Fieldlands Ursaluna Treasure Route - Pokemon Legends: Arceus
This is a fast and efficient way to get treasures.
There are other ways to get to the same destination — but this is your best bet.
Throughout the area, you can find many different items. These include balls, evolution materials, and much more.
The adventure is endless. If you get tired, just head back to the beginning and start again.