Wondering how to get Darkrai in Pokémon Legends: Arceus? The legendary Pokémon is among the most elusive in the game, and can't be caught using the usual methods for Pokémon collecting. No matter how far and wide you search, if you don't meet one crucial prerequisite you'll never encounter Darkrai out in the wild.
How to Get Darkrai in Pokémon Legends: Arceus
To catch Darkrai in Pokémon Legends: Arceus, you must have a save file for either Pokémon Brilliant Diamond or Shining Pearl on the Nintendo Switch on which you're playing Pokémon Legends: Arceus.
If you meet that requirement, you'll next need to complete the main campaign for Pokémon Legends: Arceus. That appears to be taking players about 18.5 hours on average, or 30.5 hours if all the extras are accounted for.
Once you've sat through the credits for the game, you'll be able to find a new research request in Jubilife Village. Accepting it will start you on a quest to catch Darkrai, requiring just a little more time and energy to add the Pokémon to your Pokédex.