PokéBase - Pokémon Q&A
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On this site it says they're not in any Groups, but on Bulbapedia they're in the Undiscovered Group.

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Hoopa, Diancie, and Volcanion are in the Undiscovered egg group. PM just hasn't updated their pages so that the site does say that they are in the Undiscovered egg group.
Sources: This, this, and this.

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