Area Zero, East Province (Area Three), North Province (Area Three), West Province (Area Three) — 4 locations on the interactive map.
Eevee → Vaporeon (Water Stone) → Jolteon (Thunder Stone) → Flareon (Fire Stone) → Espeon (Happiness ≥ 160) → Umbreon (Happiness ≥ 160) → Leafeon (At Eterna Forest) → Glaceon (At Sinnoh Route 217) → Sylveon (Know Fairy-type move)