From Bulbapedia, the community-driven Pokémon encyclopedia.

The Still-Water Cavern (Japanese: 水鏡大空洞 Great Water-Mirror Hollow) is a type of hideaway seen in the Grand Underground. It can only be accessed after the player obtains the Explorer Kit in Eterna City from the Underground Man, and features Pokémon that roam the cave freely instead of being found in tall grass.

Geography

The Still-Water Cavern is a large cave with rocky paths amongst trees, grass, and logs. The southern section has water which is surfable.

Items

Pokémon

With each additional badge earned by the player, the levels of wild Pokémon are increased.

ProgressionLevel Ranges
1 Badge16-20
2 Badges25-29
3 Badges29-33
4 Badges33-37
5 Badges36-40
6 Badges39-43
7 Badges42-46
8 Badges50-55
Elite Four defeated58-63

Visible Encounters

After the player fulfills a particular objective during their adventure, another group of Pokémon are added to the pool of possible encounters. The spawn rates for certain types are influenced by the active "Statue Effect" applied by a player's Secret Base Statues.

Rare Spawns

Rare Spawns run concurrently to the existing encounter table, and use independent percentages for their rates.

In other languages

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