From Bulbapedia, the community-driven Pokémon encyclopedia.

The Dazzling Cave (Japanese: きの空洞 Radiance 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

Dazzling Caves are crystal filled, dimly lit caverns. Some rocks and crystals are taller than the player, and must be navigated around.

Items

Pokémon

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

Progression Level Ranges
1 Badge 16-20
2 Badges 25-29
3 Badges 29-33
4 Badges 33-37
5 Badges 36-40
6 Badges 39-43
7 Badges 42-46
8 Badges 50-55
Elite Four defeated 58-63

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.

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