PokéBase - Pokémon Q&A
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In other words, will the Grand Underground give the Dusk Ball its multiplier or will it just be 1* like a regular Poké Ball?

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These things for some reason dataminers find very difficult to figure out.

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Best answer

According to the official Pokemon website, Dusk Balls have improved efficiency in the Grand Underground.

Stock up on Dusk Balls! No matter how well-lit a cave or cavern may be, you’re still underground where Dusk Balls will serve you well.

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0 votes

Yes it does. It is a cave, and dusk balls have a increased catch rate.

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This may well be accurate, but I wouldn't take it from this source. It's a one-line response from a random person on Gamefaqs, and the Bulbapedia article quoted says nothing that necessarily agrees with the answer.