The Under
Entered from Pyrite Town.
- COST
- 57,000 Cave Tokens
- LEVEL
- Lv 139
- ENEMY HP
- 740,000
- TIME
- 60 s
- FLOOR
- 5×5, 5 chests
- TOKENS / CATCH
- 812
HP shown with no chests opened. Each chest you open adds 20% HP to the enemies and the boss for the rest of the run.
How to open it
- Meet Rui again in Phenac City
- Talk to Rui at Mt. Battle
Boss
Waits at the end of the floor:
| Boss | Pokémon | Level | HP | Chance | Note |
|---|---|---|---|---|---|
| Cipher Admin Venus |  Delcatty | 45 | 1,010,000 | 100% | |
 Steelix | 45 | 1,010,000 | |||
 Banette | 45 | 1,010,000 | |||
 Vileplume | 44 | 1,010,000 | |||
 Suicune | 40 | 1,010,000 | Shadow Pokémon: can be caught |
Trainers
Trainers fight with their whole team; their Pokémon can't be caught, except the Shadow Pokémon marked here (see Shadow Pokémon).
| Trainer | Team | Chance | Note |
|---|---|---|---|
| Hunter Zada |   | 14% | only until 50 clears |
| Chaser Gurks |   | 14% | only until 100 clears |
| Hunter Zada | | 14% | only until 150 clears |
| Chaser Gurks |  | 14% | only until 200 clears |
| Cipher Peon Kloak |    | 3.4% | Shadow: Ledian |
| Cipher Peon Dagur |   | 14% | only until 250 clears |
| Cipher Peon Dagur |  | 14% | only until 300 clears |
| Hunter Frena |     | 3.4% | Shadow: Gligar |
| Chaser Liaks |    | 3.4% | Shadow: Stantler |
| Bodybuilder Lonia |     | 3.4% | Shadow: Piloswine |
| Rider Nelis |     | 3.4% | Shadow: Sneasel |
Chest loot
A chest first rolls a rarity, then an item of that rarity. The more times you have cleared the dungeon, the more often the rarer rarities come up (up to 500 clears). A chest sometimes holds more than one of the item.
COMMON · 75% → 60%
Lucky Incense 50% of common chests 
X Tap 50% of common chests RARE · 20% → 25%
Green Shard 33% of rare chests 
Yellow Shard 33% of rare chests 
Ochre Shard 33% of rare chests EPIC · 4.01% → 10%
Large Recharge 50% of epic chests 
Joy Scent 50% of epic chests LEGENDARY · 1.00% → 3.99%
Black Glasses 33% of legendary chests 
Timer Ball 33% of legendary chests 
Soft Sand 33% of legendary chests MYTHIC · 0.01% → 1.06%
Vivid Scent 100% of mythic chests Achievements
Clearing it 10, 100, 250 and 500 times gives the Delver, Spelunker, Old Hand and Resident achievements (see Achievements).