Forbidden Cave

The Forbidden Cave (Japanese: 禁断の洞窟 Kindan no dōkutsu) is a post-game location at the Forbidden Border of Pallaum and Alola, connecting and bordering the two regions.

The cave is also the location of Legendary Pokémon Groudon, Kyogre, Rayquaza. Returning Cave (the home of Dialga, Palkia and Giratina) also connects to Forbidden Cave.

Description
The Forbidden Cave is a natural habitat for many rare Pokémon (such as Dragonair and Babyroo). There are no Trainers in the cave. The entrance is said to be the most well-concealed entrance in the region, having only been found by very few people.