The Demon mansion sound the coolest but if it is about eevees you should probably go withe the Demon Eevees.
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Pokécharms
Easton Driscoll17
if it is about eevees then you should do lonely fire but have the eevee evolve to a flarion
The Demon Mansion
Frostless Ice
Demon Eevees
Let me know which names you guys like!