Man Walking in the Sewer Drawing

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Castelia Sewers ヒウン下水道 Hiun Sewers "Wild Missingno. appeared!"
Map description:	Iron bars around the exits were dismantled, drawing curious Trainers.
Location:	Under Castelia City
Region:	Unova
Generations:	V
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. It is 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.

Items

Item		Location	Games
	TwistedSpoon	Near the Team Plasma Grunts	B2  W2
	X Sp. Atk	Near Janitor Felix	B2  W2
	Rare Bone	North of Worker Scott Spring Summer	B2  W2
	Pearl	Near Worker Scott Autumn Winter (requires Surf) Spring Summer	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 entrance Spring Summer	B2  W2
	X Sp. Def	West of Janitor Felix Autumn Winter (requires Surf) Spring Summer	B2  W2
	HP Up	Southernmost part (requires Surf) (hidden) Spring Summer	B2  W2
	Poison Gem	Northeast of HP Up (requires Surf) (hidden) Spring Summer	B2  W2
	TM41 (Torment)	West of Scientist Clarke (requires Surf) Spring Summer	B2  W2
	Max Repel	Southwest of Janitor Felix (requires Surf) (hidden) Spring Summer	B2  W2
	Nugget	East of Worker Zack (requires Surf) (hidden) Spring Summer	B2  W2
	Ultra Ball	Northwest of Worker Scott (requires Surf) (hidden) Spring Summer	B2  W2
	Black Sludge	West of Max Repel (requires Surf) Spring Summer	B2  W2

Scientists

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) Spring Summer	B2  W2
	Full Heal	Received from male Scientist (requires Surf) Spring Summer	B2  W2
	Full Restore	Received from male Scientist (requires Surf) Spring Summer	B2  W2

Pokémon

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
Rattata	B2			W2			Walking	14-17	45%
Zubat	B2			W2			Walking	14-17	45%
Grimer	B2			W2			Walking	15, 17	10%
Surfing
Grimer	B2			W2			Surfing	5-15	100%	100%	-	-
Surfing in rippling water
Grimer	B2			W2			Rippling water	5-20	95%	95%	-	-
Muk	B2			W2			Rippling water	5-20	5%	5%	-	-
Fishing
Grimer	B2			W2			Fishing	40-70	100%	100%	-	-
Fishing in rippling water
Grimer	B2			W2			Rippling water	40-60	90%	90%	-	-
Muk	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.

Trainers

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:

P K M N Trainer Hugh Castelia Sewers Black 2 and White 2 Reward: N/A
Types: Fire Fighting Ability: Blaze Held item: Charcoal Pignite ♂ Lv.20 Flame Charge Fire Physical -- Arm Thrust Fighting Physical -- Smog Poison Special -- Defense Curl Normal Status -- Types: Normal Flying Ability: Big Pecks Held item: None Pidove ♂ Lv.18 Air Cutter Flying Special -- Leer Normal Status -- Quick Attack Normal Physical -- Roost Flying Status --

If the player chose Tepig:

P K M N Trainer Hugh Castelia Sewers Black 2 and White 2 Reward: N/A
Type: Water Unknown Ability: Torrent Held item: Mystic Water Dewott ♂ Lv.20 Razor Shell Water Physical -- Fury Cutter Bug Physical -- Water Sport Water Status -- Focus Energy Normal Status -- Types: Normal Flying Ability: Big Pecks Held item: None Pidove ♂ Lv.18 Air Cutter Flying Special -- Leer Normal Status -- Quick Attack Normal Physical -- Roost Flying Status --

If the player chose Oshawott:

P K M N Trainer Hugh Castelia Sewers Black 2 and White 2 Reward: N/A
Type: Grass Unknown Ability: Overgrow Held item: Miracle Seed Servine ♂ Lv.20 Leaf Tornado Grass Special -- Leech Seed Grass Status -- Growth Normal Status -- Wrap Normal Physical -- Types: Normal Flying Ability: Big Pecks Held item: None Pidove ♂ Lv.18 Air Cutter Flying Special -- Leer Normal Status -- Quick Attack Normal Physical -- Roost Flying Status --

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

Layout

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

Pokémon Adventures

Black 2 & White 2 chapter

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 silver background are legal to use in both the current Standard and Expanded formats.
Card	Type	English Expansion	Rarity	#	Japanese Expansion	Rarity	#
Dewott		Legendary Treasures		38/113	EX Battle Boost		030/093

In other languages

Language		Title
Chinese	Cantonese	飛雲地下水道 Fēiwàhn Deihhah Séuidouh
	Mandarin	飛雲地下水道 Fēiyún Dìxià Shuǐdào * 飛雲下水道 Fēiyún Xiàshuǐdào *
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

Unova
Settlements Nuvema Town • Accumula Town • Striaton City • Nacrene City • Castelia City • Nimbasa City • Anville Town Driftveil City • Mistralton City • Icirrus City • Opelucid City • Pokémon League • Lacunosa Town • Undella Town Black City • White Forest • Aspertia City • Floccesy Town • Virbank City • Lentimas Town • Humilau City Routes 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 Bridges and tunnels Skyarrow Bridge • Driftveil Drawbridge • Tubeline Bridge • Village Bridge • Marvelous Bridge • Marine Tube Landmarks Dreamyard • Wellspring Cave • Pinwheel Forest • Liberty Garden • Desert Resort • Relic Castle • Battle Subway • Lostlorn Forest Cold Storage • Mistralton Cave • Chargestone Cave • Celestial Tower • Twist Mountain • Dragonspiral Tower • Moor of Icirrus Challenger's Cave • Victory Road (BW • B2W2) • N's Castle • Royal Unova • Giant Chasm • Undella Bay • Abyssal Ruins Abundant Shrine • Poké Transfer Lab • P2 Laboratory • Entralink • Unity Tower • Floccesy Ranch • Pledge Grove • Virbank Complex Pokéstar Studios • Castelia Sewers • Join Avenue • Cave of Being • Pokémon World Tournament • Reversal Mountain • Plasma Frigate Clay Tunnel • Underground Ruins • Strange House • Relic Passage • Seaside Cave • White Treehollow • Black Tower Access to Nature Preserve

Man Walking in the Sewer Drawing

Source: https://bulbapedia.bulbagarden.net/wiki/Castelia_Sewers

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