This 20 floor dungeon is only available through a Nintendo Event using the Wonder Mail code: ??MH CJ(...)? 44?P CF?8 7J6R (...)M?1.
| Name | Type | Level | EXP | Levels seen | Recruit Rate |
|---|---|---|---|---|---|
| Shellder | 25 | 1-5 | 12.2% | ||
| Wingull | 23 | 1-5 | 12.5% | ||
| Tentacool | 27 | 1-9 | 8.3% | ||
| Omanyte | 30 | 1-9 | 8% | ||
| Slowpoke | 25 | 6-14 | 12% | ||
| Seel | 30 | 6-14 | 3.9% | ||
| Remoraid | 28 | 10-19 | 8.8% | ||
| Spheal | 22 | 10-19 | 8.8% | ||
| Anorith | 26 | 14-20 | 8.7% | ||
| Grimer | 20 | 20 | 12.2% | ||
| Omastar | 35 | 20 | N/A |