Ultra Deep Sea, Pokémon Wiki

Ultra Deep Sea, referred to as Ultra Space in Pokémon Sun and Moon, is one of the several worlds of Ultra Space accessible though Rarity 1 White Warp Holes after defeating Necrozma, it's the home of Nihilego. In Pokémon Sun and Moon, after Nebby evolves into Solgaleo or Lunala, it takes the player and Lillie to Ultra Deep Sea, where Lusamine is faced for the last time. Ultra Deep Sea is a dark cave with a dark stone path that ends in a dead end with a small rock where the player can sit. There a

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Ultra Deep Sea - Bulbapedia, the community-driven Pokémon encyclopedia