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Regional Eevee
Still Normal but has “Contrary” as it’s primary Ability
Instead of evolving the correct Eeveelutions it evolves into a mon who has type advantage or resistance to the correct evolution from the list of “physical” types
Fire
>Rock
Electric
>Ground
Psychic
>Ghost
Dark
>Bug
Ice
>Steel
Grass
>Flying
Fairy
>Poison
And then Water Stone makes an aquatic Dragon type who can resist Water, maybe with Multiscale to tank Vaporeon’s Ice TMs.
Flavor text implies none of these including Eevee can survive in the wild even though they are strong as their nature was only a result of Breeders selectively breeding tsundere personalities.