One of the new Pokémon you will encounter is the region of Hisui, the mighty Ursaluna. This new Pokémon has the power to sense treasure in an area and unearth it. This gives you access to new items that you won't be able to find otherwise and additional crafting items. Here's how to get Ursaluna as a ride-on Pokémon in Pokémon Legends: Arceus.
How to unlock Ursaluna
You won't be able to get Ursaluna until you've completed some of the story missions and reached the Crimson Myrene Lands. Towards the end of the story in the Crimson Marshlands, you will be assigned the task of fighting Ursaluna to get her out of her angry state. Make sure you bring Pokémon that know combat type moves, grass, ice, or water as Ursaluna is weak for those. After combat, Ursaluna can be summoned using your Celestica Flute just like Wyrdeer.
Ride Ursaluna and find treasures
To drive on Ursaluna, press left or right on the D-Pad. You will see the Wyrdeer symbol change to Ursaluna. Just like Wyrdeer, press the + button to summon Ursaluna. Note that Ursaluna cannot run or jump like Wyrdeer can. Instead, you will see a heartbeat come out of Ursaluna's muzzle. This pulse wave starts out small and green, but gets bigger and changes color as you get closer to the treasure. Follow the button until it becomes uncontrollable and press the Y Button when prompted to dig a treasure.