Cave of Being

Cave of Being is a cavern in Unova, located on Route 20. It is described as being connected to Sinnoh. Professor Juniper can be found inside here after the player has defeated the Champion. If she is spoken to, Uxie, Mesprit, and Azelf will appear. They cannot be caught here; rather, each Pokémon will travel to a different part of Unova, awaiting capture. Uxie can be found outside Nacrene Museum, Mesprit will be at Celestial Tower, and Azelf will be on Route 23.