Ancient Caustic Sewers

Ancient Caustic Sewers, also known as ACS, is a continuation dungeon of Caustic Sewers. The green water in this dungeon can poison a water, flying, or levitating Pokémon, so bringing a Pokémon with Refresh (or part Steel) will help you throughout this dungeon.

Scenery
The dungeon is light green in color and has light green water.

Pokémon
''Pokémon in bold are recruitable. Please visit the Recruitable Pokemon page for more information.'' .
 * Solosis (Dawn/Day/Night)
 * Duosion
 * Reniculus
 * Ferroseed (Day and Night)
 * Ferrothorn
 * Raticate
 * Gengar
 * Venomoth
 * Arbok
 * Ariados
 * Golbat
 * Crobat
 * Nidoqueen
 * Nidoking
 * Muk
 * Seviper
 * Dustox
 * Skuntank
 * Bronzong
 * Garbodor

End Box Items
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Secret Room
The room contains 2 Deluxe Boxes, by which could contain these items:
 * Relic Vase

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 * Revival Herb
 * TM Sludgewave
 * Golden Apple

(This is likely incomplete, feel free to add onto it)

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Dungeon Objective
Mainly, the dungeon objective is to clear it and also recruiting Solosis or Ferroseed.

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Tips
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 * Bring a Pokémon with Refresh or part steel (LOTS OF POISON)
 * There is a Kecleon Shop at F12

Etc.

 * Trivia: This is the highest level dungeon in tanren underground.