Castelia Sewers

Castelia Sewers ヒウン下水道
Hiun Sewers
"Wild Missingno. appeared!"
Castelia Sewers dry B2W2.png
Map description: Iron bars around the exits were dismantled, drawing curious Trainers.
Location: Under Castelia City
Region: Unova
Generations: V
Unova Castelia Sewers Map.png
Location of Castelia Sewers in Unova.
Pokémon world locations

The Castelia Sewers (Japanese: ヒウン下水道 Hiun Sewers) is a location in central south Unova.

In the games

The sewers are accessible via an entrance in Castelia City at the end of Thumb Pier. They cannot be accessed until the player talks to Clyde in front the Castelia Gym. When exploring for the first time, Hugh will join the player as a Multi Battle partner. Here, the player meets Colress for the first time. Relic Passage is accessible 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.


Item Location Games
  TwistedSpoon Near the Team Plasma Grunts  B2  W2 
  X Sp. Atk Near Janitor FelixSpringSummer  B2  W2 
  Rare Bone North of Worker ScottSpringSummer  B2  W2 
  Pearl Near Worker Scott AutumnWinter(requires Surf)SpringSummer  B2  W2 
  Leftovers Near Doctor Heath  B2  W2 
  HM04 (Strength) From Hugh after defeating the Team Plasma Grunts  B2  W2 
  Heart Scale West of the Relic Passage entranceSpringSummer  B2  W2 
  X Sp. Def West of Janitor Felix AutumnWinter(requires Surf)SpringSummer  B2  W2 
  HP Up Southernmost part (requires Surf) (hidden)SpringSummer  B2  W2 
  Poison Gem Northeast of HP Up (requires Surf) (hidden)SpringSummer  B2  W2 
  TM41 (Torment) West of Scientist Clarke (requires Surf)SpringSummer  B2  W2 
  Max Repel Southwest of Janitor Felix (requires Surf) (hidden)SpringSummer  B2  W2 
  Nugget East of Worker Zack (requires Surf) (hidden)SpringSummer  B2  W2 
  Ultra Ball Northwest of Worker Scott (requires Surf) (hidden)SpringSummer  B2  W2 
  Black Sludge West of Max Repel (requires Surf)SpringSummer  B2  W2 


A female Scientist in a room near Doctor Heath and a male Scientist in a room near Janitor Brady are attempting to turn poison into medicine, and will give the player items created in their experiments. They can give out any one of these items on a daily basis.

Item Location Games
  Potion Received from female Scientist  B2  W2 
  Super Potion Received from female Scientist  B2  W2 
  Revive Received from female Scientist  B2  W2 
  Antidote Received from male Scientist (requires Surf)SpringSummer  B2  W2 
  Full Heal Received from male Scientist (requires Surf)SpringSummer  B2  W2 
  Full Restore Received from male Scientist (requires Surf)SpringSummer  B2  W2 


Hugh will partner with the player for the first time the player traverses the sewers, and these Pokémon will be faced in Double Battles with Hugh as partner.

Pokémon Games Location Levels Rate
Sp Su Au Wi
B2 W2
14-17 45%
B2 W2
14-17 45%
B2 W2
15, 17 10%
B2 W2
5-15 100% 100% - -
Surfing in rippling water
B2 W2
  Rippling water
5-20 95% 95% - -
B2 W2
  Rippling water
5-20 5% 5% - -
B2 W2
40-70 100% 100% - -
Fishing in rippling water
B2 W2
  Rippling water
40-60 90% 90% - -
B2 W2
  Rippling water
50-70 10% 10% - -
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.


Even when partnered with Hugh, Trainers other than the Team Plasma Grunts are engaged only in Single Battles, without Hugh.

  If the player chose Snivy:

  If the player chose Tepig:

  If the player chose Oshawott:

Trainer Pokémon
Janitor Felix
カンキチ Kankichi
Reward: $640
  Lillipup Lv.16
No item
  Trubbish Lv.16
No item
Doctor Heath
タイゾウ Taizō
Reward: $1020
  Sewaddle Lv.17
No item
Worker Zack
ザック Zack
Reward: $680
  Drilbur Lv.17
No item
Team Plasma Grunt
Reward: $1280
Double Battle with the following Grunt
  Sandile Lv.16
No item
Team Plasma Grunt
Reward: $1280
Double Battle with the previous Grunt
  Scraggy Lv.16
No item
Requires Surf during spring and summer;
normal access during autumn and winter
Worker Scott
スコット Scott
Reward: $640
  Timburr Lv.17
No item
Autumn and winter only
Scientist Caroline
ユウコ Yūko
Reward: $816
  Grimer Lv.17
No item
Spring and summer only (requires Surf)
Scientist Clarke
タカアキ Takaaki
Reward: $816
  Magnemite Lv.17
No item
Janitor Brady
ムネノリ Munenori
Reward: $1240
  Marill Lv.31
No item
  Cinccino Lv.31
No item


Version Flooded Dry Back rooms
Black 2      
White 2

In the anime

Castelia Sewers in the anime

The Castelia Sewers appeared in A Venipede Stampede!. While investigating them, Burgh, Ash, and his friends found a Venipede stuck in one of the pipes and helped it, before an entire swarm of Venipede appeared.

Notably, this area appeared in the anime long before it was introduced in the games.

In the manga

Castelia Sewers in Pokémon Adventures

Pokémon Adventures

Black 2 & White 2 arc

The Castelia Sewers were first mentioned in Choir Tournament, where Looker received word from Blake that two of the Seven Sages had been spotted in the sewers of Castelia City.

In Angry Boy, Roxie discovered a man who had been attacked by Team Plasma, who stole his Karrablast and ran off into the sewers. Blake, Whitley, and Hugh each headed into the sewers with Roxie to find the culprits. During an encounter with a group of Team Plasma Grunts, the group got scattered, with Hugh then being found by Looker's Croagunk. Using a Xtransceiver on Croagunk's hat, Looker tried to question Hugh about what he knew about Team Plasma, but Hugh refused to tell him anything. Meanwhile, Whitley managed to rescue the Pokémon stolen by the Team Plasma Grunts with the help of Foongy, while Blake effortlessly captured Bronius and Ryoku before heading out to investigate the source of the cold air coming out of the Relic Passage.

In the TCG

This listing is of cards mentioning or featuring Castelia Sewers in the Pokémon Trading Card Game.

Related cards
Cards listed with a blue background are only legal to use in the current Expanded format.
Cards listed with a green background are legal to use in both the current Standard and Expanded formats.
Card Type English
Rarity # Japanese
Rarity #
Grimer   Next Destinies   52/99 Psycho Drive   026/052
Raticate   Boundaries Crossed   105/149 Freeze Bolt   047/059
Dewott   Legendary Treasures   38/113 EX Battle Boost   030/093

In other languages

Language Title
Chinese Cantonese 飛雲下水道 Fēiwàhn Deihhah Séuidouh *
飛雲地下水道 Fēiwàhn Deihhah Séuidouh *
Mandarin 飛雲下水道 / 飞云下水道 Fēiyún Xiàshuǐdào *
飛雲地下水道 Fēiyún Dìxià Shuǐdào *
  French Égouts de Volucité
  German Stratos-Kanalisation
  Italian Fogne di Austropoli
  Korean 구름하수도 Gureum Hasudo
  Polish Kanały Castelii
  Spanish Cloacas Porcelana
  Vietnamese Cống thoát nước Hiun

Nuvema TownAccumula TownStriaton CityNacrene CityCastelia CityNimbasa CityAnville Town
Driftveil CityMistralton CityIcirrus CityOpelucid CityPokémon LeagueLacunosa TownUndella Town
Black CityWhite ForestAspertia CityFloccesy TownVirbank CityLentimas TownHumilau City
Bridges and tunnels
Skyarrow BridgeDriftveil DrawbridgeTubeline BridgeVillage BridgeMarvelous BridgeMarine Tube
DreamyardWellspring CavePinwheel ForestLiberty GardenDesert ResortRelic CastleBattle SubwayLostlorn Forest
Cold StorageMistralton CaveChargestone CaveCelestial TowerTwist MountainDragonspiral TowerMoor of Icirrus
Challenger's CaveVictory Road (BWB2W2) • N's CastleRoyal UnovaGiant ChasmUndella BayAbyssal Ruins
Abundant ShrinePoké Transfer LabP2 LaboratoryEntralinkUnity TowerFloccesy RanchPledge GroveVirbank Complex
Pokéstar StudiosCastelia SewersJoin AvenueCave of BeingPokémon World TournamentReversal MountainPlasma Frigate
Clay TunnelUnderground RuinsStrange HouseRelic PassageSeaside CaveWhite TreehollowBlack Tower
Access to
Nature Preserve
Blueberry AcademyTerarium

  This article is part of Project Locations, a Bulbapedia project that aims to write comprehensive articles on every location in the Pokémon world.