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Castelia Sewers is found by an entrance in Castelia City on the pier near the Gate Bridge, located in South Unova. Hugh will join the player as a partner when you explore the first time. And also, for the first time, you will meet Colress.
- The Relic Passage can be accessed from here.
- There is also an exit to Castelia City's park with wild Pokémon, and when the sewers are flooded, to Castelia City's back alley.
- During autumn and winter, the sewers are dry, blocking some areas and removing the requirement of Surf to access others.
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Abundant Shrine · Abyssal Ruins · Battle Subway · Castelia Park B2W2 · Castelia Sewers B2W2 · Casteliacone · Cold Storage
Desert Resort · Dreamyard · Entralink · Entree Forest · Floccesy Ranch B2W2 · Hidden Grotto B2W2 · Join Avenue B2W2 · Liberty Garden
Marine Tube B2W2 · Moor of Icirrus · Plasma Frigate B2W2 · Pokéstar Studios B2W2 · Relic Passage B2W2 · Royal Unova
Undella Bay B2W2 · Underground Ruins B2W2 · Virbank Complex B2W2 · White Treehollow B2W2
|Kanto (Sevii Islands) · Johto · Hoenn · Sinnoh (Battle Zone) · Unova · Kalos · Alola|