Under Colosseum
Entered from Pyrite Town.
- COST
- 91,500 Cave Tokens
- LEVEL
- Lv 141
- ENEMY HP
- 1,603,000
- TIME
- 60 s
- FLOOR
- 5×5, 5 chests
- TOKENS / CATCH
- 845
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
- Finish Sand and Shadow
Boss
Waits at the end of the floor:
| Boss | Pokémon | Level | HP | Chance | Note |
|---|---|---|---|---|---|
| Shady Guy Fein |  Armaldo | 68 | 2,100,000 | 100% | |
 Milotic | 68 | 2,100,000 | |||
 Manectric | 68 | 2,100,000 | |||
 Houndoom | 68 | 2,100,000 | |||
 Gyarados | 68 | 2,100,000 | |||
 Togetic | 70 | 2,100,000 | 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 |
|---|---|---|---|
| School Kid Sainz |    | 6.3% | |
| Teacher Foshe |    | 6.3% | |
| Bodybuilder Glya |    | 6.3% | |
| Rider Fokil |    | 6.3% | |
| Reporter Sclim |    | 6.3% | |
| Hunter Rina |    | 6.3% | |
| Rider Kou |    | 6.3% | |
| Bandana Guy Roblin |    | 6.3% | |
| School Kid Sainz |    | 6.3% | |
| Teacher Foshe |    | 6.3% | |
| Bodybuilder Glya |    | 6.3% | |
| Rider Fokil |    | 6.3% | |
| Reporter Sclim |    | 6.3% | |
| Hunter Rina |    | 6.3% | |
| Rider Kou |    | 6.3% | |
| Bandana Guy Roblin |   | 6.3% |
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%
X Attack 50% of common chests 
Poké Ball 50% of common chests RARE · 20% → 25%
Blue Shard 33% of rare chests 
Purple Shard 33% of rare chests 
Ochre Shard 33% of rare chests EPIC · 4.01% → 10%
Persim Berry 33% of epic chests 
Sitrus Berry 33% of epic chests 
Joy Scent 33% of epic chests LEGENDARY · 1.00% → 3.99%
Lum Berry 50% of legendary chests · after 50 clears 
Excite Scent 50% of legendary chests MYTHIC · 0.01% → 1.06%
Muscle Band 50% of mythic chests · after 100 clears 
Vivid Scent 50% of mythic chests Achievements
Clearing it 10, 100, 250 and 500 times gives the Delver, Spelunker, Old Hand and Resident achievements (see Achievements).