PokéBase - Pokémon Q&A
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Unfortunately, you cannot obtain either.

Despite being on the cover, Groudon and Kyogre are not available in the game unless traded from a Game Boy Advance game.

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That's only for Colosseum. Bulbapedia doesn't mention about XD Gale of Darkness.
Nevermind. They told in Colosseum's case because it had the box art of them. So I guess this answer is correct.
If this helped can you select this as the best answer?