PokéBase - Pokémon Q&A
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Route 116 (hidden Pokémon)
after capturing or defeating Groudon/Kyogre.

Yes, it is possible to get Eevee before getting the National Dex, you just have to fight Groudon or Kyogre and win (by catching or Defeating them) for Eevee to appear as a Hidden Pokémon.

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Thank you Staka