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To get Darkrai in Pokémon Brilliant Diamond and Shining Pearl, you first need to download the Member Card via the Mystery Gift feature.
You must do this before Saturday, 30th April since catching Darkrai is a limited-time event. If you don't download the Member Card before this date, you'll never be able to add Darkrai to your Pokédex!
Due to this, we recommend downloading the Member Card even if you don't currently meet all of the requirements to catch Darkrai.