Overview of Tanren Undercity
Tanren Undercity, referred to by players as undercity or sometimes TU, is a city settled under the Tanren region with its own dungeons and currency called 
Ekop. Its entrance is located at Tanren's Archaeological Digsite, in the museum of Tanren City. To access the main entrance of Tanren Undercity, Rock Smash and Rock Climb are required. If Undercity Catacombs has been completed, players can take a shortcut to Tanren Undercity in cognito.
Dungeons[]
- Main page: Category:Undercity dungeons
Locations[]
Central Fork[]
The Central Fork is the central part of Tanren Undercity, which is the connection to all the other locations in Tanren Undercity.
| NPCs |
|---|
Mansion[]
There is a mansion located north in the Central Fork. Trying to enter any of the curtains here gives the message "Perhaps you shouldn't enter this room...". Going to the wall in the middle gives the message "The structuring of this wall seems quite fragile.. Perhaps if you had the right move, it could be broken.". Using the move Rock Smash on the wall will open the entrance to the Abandoned Laboratory.
| NPCs |
|---|
Abandoned Laboratory[]
The Abandoned Laboratory is accessed from the Tanren Undercity Mansion. This room's only purpose is to change the form of Rotom. At the top of the laboratory are the five appliances in the order of fan, oven, fridge, lawn mower, and washing machine. The TV on the table with the refrigerator gives the message "These machines look cryptic. If you have a specific pokemon, maybe you could use them."
Northern Settlement[]
The northern settlement is northeast from the Central Fork, and commonly thought as the main area in Tanren Undercity. Here you have access to an Assembly, Kangaskhan Storage, and a healing point, being Toren's House.
There is also a Purple Kecleon here who runs a shop, notable for being the only shop in Tanren Undercity that uses 
Poké as all other shops in Tanren Undercity use Ekop, excluding the services in the gang bases.
| NPCs |
|---|
Toren's House[]
| NPCs |
|---|
Molly's House[]
| NPCs |
|---|
Brock's House[]
| NPCs |
|---|
Dark Market[]
- Main article: Dark Market
This is one of the main features in Tanren Undercity. In this market, you can buy items from various NPCs running booths with different types of items with Ekop.
Sunken Tavern[]
The Sunken Tavern is a local bar in Tanren Undercity. You can buy some exclusive drinks in here from Sebastian using Ekop. The active Pokémon has to be level 21 or higher in order to enter.
| IS | Item | Price |
|---|---|---|
 | Fresh Water | 20 Ekop |
 | Flamethrower | 25 Ekop |
| Blizzard | 25 Ekop |
| Thunderbolt | 25 Ekop |
| Cheri Beri Delite | 35 Ekop |
 | Soda Pop | 35 Ekop |
 | Lemonade | 45 Ekop |
 | Aged Grepa Juice | 60 Ekop |
| NPCs |
|---|
Gang base building
Gang Bases[]
Players are automatically associated with either Night Talons or Desert Fangs, the two the Tanren Undercity gangs, upon character creation. You can check your character ID along with what gang you affiliate with using the command /charid.
There's a building south of the Central Fork; when entered you appear in the headquarters of your respective gang. These bases hold the basic services in the undercity, along with a shop that has exclusive items.
Night Talons' Base[]
Only players with a Minun ID have access to the Night Talons' base. You can set your spawn point at this base on the healing bed here for 3,000 Poké.
Services:
- Sven the Sharpedo will clean sticky or grimy items
- Butch the Scrafty will open boxes for 150 Poké each
- Rouge the Purrloin sells the following items:
| IS | Item | Price |
|---|---|---|
 | Focus Sash | 100 Ekop |
 | Eject Button | 200 Ekop |
 | Razor Claw | 250 Ekop |
 | Zoom Lens | 350 Ekop |
 | Weakness Policy | 450 Ekop |
 | Safety Goggles | 400 Ekop |
 | Choice Specs | 500 Ekop |
 | Choice Scarf | 500 Ekop |
 | Aether Necklace | 1000 Ekop |
| Aether Pendant | 1150 Ekop |
| Aether Medallion | 1250 Ekop |
| Aether Locket | 1350 Ekop |
| NPCs |
|---|
Desert Fangs' Base[]
Only players with a Plusle ID have access to the Desert Fangs base. You can set your spawn point at this base on the healing bed here for 3,000 Poké
Services:
- Dorothy the Gengar will clean sticky or grimy items
- Princess the Pangoro will open boxes for 150 Poké each
- Sam the Zorua (looks like a Krookodile because of Illusion) sells the following items:
| IS | Item | Price |
|---|---|---|
| Focus Sash | 100 Ekop |
| Eject Button | 200 Ekop |
 | Razor Fang | 250 Ekop |
| Zoom Lens | 350 Ekop |
 | Rocky Helmet | 400 Ekop |
 | Assault Vest | 450 Ekop |
 | Choice Band | 500 Ekop |
| Choice Scarf | 500 Ekop |
 | Skull Necklace | 1000 Ekop |
| Skull Pendant | 1150 Ekop |
| Skull Medallion | 1250 Ekop |
| Skull Locket | 1350 Ekop |
| NPCs |
|---|
Trivia[]
- Tanren Undercity was released on September 1st in 2016.
- The shortcut to Tanren Undercity in cognito was added on March 19th of 2019.
- Tanren Undercity was initially supposed to have player combat to represent rivalry between the two gangs, however the idea was scrapped in favor of earlier release.
- The Sunken Tavern requiring a level 21 or above Pokémon is in reference to the age of 21 being the legal drinking age in some countries, namely the United States.[1]
- The three NPCs in the mansion are a reference to Fire Emblem Fates.
- Chatler likely owns its name to a Chatot kept by Pearl in the Pokémon Adventures manga series.
- Rango the Charmeleon may get the name from the protagonist of the titular animation movie.
- The Crobat named Vlad could be a nod to the Voivode Vlad III.