Caustic Sewers

Caustic Sewers, also known as CS, is a dungeon found in the Tanren Undercity. The green water in this dungeon can poison a water, flying, or levitating Pokémon, so bringing a Pokémon with Refresh will help you throughout this dungeon.

Scenery
Lower Floors Middle Floors Upper Floors
 * Floors 1-11Sewerslow.png
 * Floors 11-20Sewers.png
 * Floors 21-30

Boss
The boss is a resemblance to Team Skull from Explorers of Time/Darkness/Sky, which are Skuntank, Koffing, and Zubat. Skuntank drops 35 Ekops when it's defeated. Koffing and Zubat drop 1 Tiny Mushroom each.
 * Skuntank
 * Koffing
 * Zubat

Pokémon
The Pokémon here are mostly Poison, Ghost, Dark, and Steel.

''Pokémon in bold are recruitable. Please visit the Recruitable Pokémon page for more information.''

Kecleon Shop Items
The Kecleon shop in Caustic Sewers spawns on 28F. Note that in case of a small room the shop may fail to spawn.

Dungeon Objective
As with most dungeons, the goal is to complete it and go to Ancient Caustic Sewers. Caustic Sewers is also a location where a Pink Silk may be obtained. This can be accomplished by unlocking the Sealed Chamber on 25F with a Silver Key and having the contents of the box contained appraised. Secret Room: Ending box:
 * TM Toxic
 * Poison Dust
 * TM Venoshock
 * Full Restore
 * Big Nugget
 * Max Revive
 * Purity Relic

Tips
Bring a Pokémon with Refresh.

Purity relic/Safeguard/Status immunity gems are recommended.

There is a kecleon shop at 28f

Trivia
Caustic Sewers has one of the highest level ranges out of all the Tanren Undercity dungeons.