Undercity Catacombs (Catacombs, UC) is a dungeon located southwest of Tanren Undercity. This dungeon is mostly comprised of Rock-, Ghost-, and Poison-type Pokémon.
Attributes
| Traps | |
|---|---|
| Icon | Name |
|
Explosion Trap |
|
Grudge Trap |
|
Grimy Trap |
|
Mud Trap |
|
PP-Zero Trap |
|
Seal Trap |
|
Shocker Trap |
|
Spin Trap |
|
Stealth Rock Trap |
|
Sticky Trap |
|
Trip Trap |
|
Warp Trap |
|
Wonder Tile |
All floors have darkness, along with small water tiles spread out along the floors. Water stops appearing on Floor 21 onwards.
There is a warp puzzle after Floor 20. It can be relatively easy should the player commit the puzzle to memory. Below is a guide.
Boss
Upon reaching the end of the dungeon, the player will get the attention of a single Onix who proceeds to call in another Onix and their boss, a Steelix. The second Onix questions how they player got in despite the place being barricaded. Steelix questions how the player, a small Pokémon (even if the player is playing as something like an Onix) managed to get this far. The three then attack the player. Once defeated, Steelix is in shock that the player beat them and orders the Onix to take what they have and leave. Before they do, Officer Magnezone and his two Magnemites come in and try to arrest the three for repeated crimes across Tanren. Steelix and the Onix manage to escape. Magnezone then orders Deputy Magnemite to notify all of the deputies before asking the player if they saw where they went, getting visible silence. Magnezone takes note of this and tells the Magnemite that they need to leave. After this, the passage to the end room opens up.
| Bosses | |||||
|---|---|---|---|---|---|
| Portrait | # | Pokémon | Type | Drops | Moves |
 | 095 | Onix |   | None |
|
| 095 | Onix | | None |
|
 | 208 | Steelix |  | None |
|
Dialogue:
- ???: Hunh? What was that noise?
- Onix(1): Eh? What's this? An intruder?
- Onix(1): Yo kid, why don't you move it on out of here. This ain't none of your business, you hear?
- [Player Name]: ...
- Onix(1): No, eh? Fine, we'll just have to get you out ourselves. Onix, Boss, there's an intruder here!
- Onix(2): Hmm? an intruder, where? How'd they even get in, we barricaded the place!
- Onix(2): Well, would you look at that. It is an intruder.
- Onix(2): Boss, check this out! Did you hear us?
- The Boss: Heh. A little brat, coming into the Catacombs... Probably another little explorer.
- Steelix: Hmph. Impressive that a small little Pokémon like you actually made it this far. But that's nothing to me.
- Well, regardless if you're here for the treasure or not, you still saw us. Which is a huge problem. Right boys?
- Both Onix: Yeah, boss, definitely!
- Steelix: Yep. That means we're ready to take you out! Get ready!
- Both Onix: Yeah, get ready...
- ALL: To get crushed.
- [Player Name]: ...
- Steelix: GAH! How can this be?! Some little pesky explorer coming into here, in the middle of our MISSION, and then they manage to beat us in battle?
- Steelix: Well, whatever, let's take what we have and get out of here before someone else sees us. Hurry, Onix.
- Both Onix: R-Right Boss!
- ???: Oh no, you don't!
- Officer Magnezone: You're not going anywhere! You three have a huge bounty over your heads for repeatedly committing crimes throughout the Tanren Region.
- Officer Magnezone: You three are going to the jail for a LONG time. Get it moving! Zzt Zzt!
- Steelix: I don't think so. Guys, run!
- SLAM! Steelix struck Officer Magnezone with his body.
- Steelix: Quick, go, go, go!
- Shuffle, shuffle, shuffle...
- Officer Magnezone: Don't let them get away, stop them!
- Officer Magnezone: Bwah! They got away! Zzt! Put out a call to all of the deputies, Magnemite!
- Deputy Magnemite: Zzt! Sir yes sir! Zzt!
- Officer Magnezone: Did you happen to see where they went?
- [Player Name]: ...
- Officer Magnezone: Ah, guess not. You two, let's move then!
- Both Magnemite: Right!
Undercity Catacombs End
The end room contains two boxes.
Box items:
Ekop- Purple Bow
- Metal Coat
- Psyche Dust
- King's Rock
- Shiny Stone
- Dusk Stone
- Dawn Stone
- Reaper Cloth
- Rotten Apple
- Old Gateau
- Max Potion
- Max Elixir
- Restore Power
- Revive
- Max Revive
- Purple Gummi
- Relic Copper
- Relic Silver
- Relic Gold
- TM Payback
- Invisify Orb
Secret Room
Undercity Catacombs can spawn Secret Rooms starting from Floor 11. There are two boxes in the Secret Room. You can also use 
Honey to spawn a horde of Mandibuzz that may include a recruitable Vullaby. Vullaby can only spawn once per Secret Room.
Box items:
- Nothing
- Moon Stone
- Sun Stone
- Lunar Ribbon
- Dusk Stone
- Max Potion
- Revival Herb
- Restore Power
- Revive
- Max Revive
- Lum Berry
- Rare Fossil
- Rare Bone
- Relic Copper
- Relic Gold
- Relic Vase
- TM Shadow Ball
Pokémon
Pokémon in bold are recruitable. Please visit the Recruitable Pokémon page for more information.
| Portrait | # | Pokémon | Floor | Recruit rate |
|---|---|---|---|---|
 | 042 | Golbat | 1-30F | Unrecruitable |
 | 093 | Haunter | 1-30F | Unrecruitable |
| 095 | Onix | 1-30F | Unrecruitable |
 | 302 | Sableye | 1-30F | Unrecruitable |
 | 305 | Lairon | 1-30F | Unrecruitable |
 | 105 | Marowak | 1-30F | Unrecruitable |
 | 356 | Dusclops | 1-30F | Unrecruitable |
 | 442 | Spiritomb | 1-30F | Unrecruitable |
 | 632 | Durant | 11-20F | -7.5% |
 | 629 | Vullaby | 11-29FSRSecret Room spawn using Honey | -4.9% |
 | 630 | Mandibuzz | 11-29FSRSecret Roomspawn using Honey | Unrecruitable |
 | 076 | Golem | 21-30F | Unrecruitable |
 | 094 | Gengar | 21-30F | Unrecruitable |
 | 105 | Alolan Marowak | 21-30F | -0.6% |
 | 169 | Crobat | 21-30F | Unrecruitable |
 | 229 | Houndoom | 21-30F | Unrecruitable |
 | 275 | Shiftry | 21-30F | Unrecruitable |
 | 306 | Aggron | 21-30F | Unrecruitable |
 | 344 | Claydol | 21-30F | Unrecruitable |
 | 452 | Drapion | 21-30F | Unrecruitable |
 | 472 | Gliscor | 21-30F | Unrecruitable |
 | 477 | Dusknoir | 21-30F | Unrecruitable |
 | 518 | Musharna | 21-30F | Unrecruitable |
 | 562 | Yamask*only attacks in self-defense | 21-30F (dusk/night) | -3% |
 | 608 | Lampent | 21-30F | Unrecruitable |
 | 609 | Chandelure | 21-30F | Unrecruitable |
Items
| IS | Item | Location | Tile | Hidden |
|---|---|---|---|---|
|
1-5 Ekop | 1-30F | Floor | No |
|
Dark Diamond | 1-30F | Wall | Yes |
|
Ghost Diamond | 1-30F | Wall | Yes |
|
Moon Stone | 1-30F | Floor | Yes |
|
Sun Stone | 1-30F | Floor | Yes |
|
Dusk Stone | 1-30F | Floor | Yes |
|
Rotten Apple | 1-30F | Floor | No |
|
Ether | 1-30F | Floor | Both |
|
Max Ether | 1-30F | Floor | Both |
|
Oran Berry | 1-30F | Floor | No |
|
Rawst Berry | 1-30F | Floor | No |
|
Blast Seed | 1-30F | Floor | No |
|
Plain Seed | 1-30F | Floor | No |
|
Reviver Seed | 1-30F | Floor | Yes |
|
Vanish Seed | 1-30F | Floor | No |
|
Gummis | 10-30F | Floor | No |
|
Iron Thorn | 1-30F | Floor | No |
|
Silver Spike | 1-30F | Floor | No |
|
Stick | 1-30F | Floor | No |
|
Geo Pebble | 1-30F | Floor | No |
|
Gravelerock | 1-30F | Floor | No |
|
Big Nugget | 1-30F | Wall | Yes |
|
Rare Bone | 1-30F | Floor, Wall | Both |
|
TM Dark Pulse | 1-30F | Floor | Yes |
|
TM Facade | 1-30F | Floor | No |
|
TM Shadow Ball | 1-30F | Wall | Yes |
|
TM Will-O-Wisp | 1-30F | Floor | No |
|
All Power-Up Orb | 1-30F | Floor | No |
|
Cleanse Orb | 1-30F | Floor | No |
|
Health Orb | 1-30F | Floor | No |
|
Invisify Orb | 1-30F | Floor | No |
|
Recycle Orb | 1-30F | Floor | No |
|
Slumber Orb | 1-30F | Floor | No |
|
Shards | 21-30F | Floor | Yes |
Dungeon Objective
The objective of the dungeon is to complete it and gain access to Undercity's shortcut in Cognito. This is also the only dungeon where Yamask and Alolan Marowak are recruitable, and also has Vullaby as a recruitable Pokémon that can be spawned with Honey in the Secret Room (though you can save Honey if you attempt to recruit it in Spectral Thicket instead). Durant can also be recruited here, though it can also be found in Rocky Ravine at a better recruit rate.
Tips
- Bring some Honey with you if you intend on recruiting Vullaby, which only spawns in the Secret Room.
- Bring something that can negate/heal Paralysis, as the dungeon's Onix know Dragon Breath.
Trivia
- Alolan Marowak was added on July 31st, 2023.