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Ancient Caustic Sewers
AncientCausticSewersEntrance
Ancient Caustic Sewers entrance

Floors

15

Random

Yes

Weather

No

Boss

No

Set Level

No

Secret Room

Yes

Monster House

Yes

Level Range

60 to 75

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.

Dungeon Parts

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

Mystery Eggs

  • Ferroseed

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End Box Items

Name Location Rates
Big Nugget End Box N/A
Max Revive End Box N/A
TM Sludge Bomb End Box N/A
Old Gateau End Box N/A
TM Poison Jab End Box N/A
TM Venoshock End Box N/A
Purity Relic End Box N/A
Poison Dust End Box N/A
Full Restore End Box N/A

.

Secret Room

ACS SR

The room contains 2 Deluxe Boxes, by which could contain these items:

  • Relic Vase
  • Revival Herb
  • TM Sludgewave
  • Golden Apple

.

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

.

Dungeon Objective

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

.

Tips

  • 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.