PokéBase - Pokémon Q&A
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https://pokemondb.net/pokebase/330603/can-you-breed-legendary-pokemon-in-firered-leafgreen
Not quite the same question, but the answer is the same, so I think this is a dupe.

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Pokémon in this Egg Group have the unique ability to breed with any member of every other Egg Group, except for the Undiscovered and Ditto Egg Groups.

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Darkrai is in the undiscovered group. It can't breed.

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Any Pokemon in the Undiscovered Group cannot breed, even with Ditto.

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