Ultra Deep Sea

Ultra Deep Sea (Japanese: ウルトラディープシー Ultra Deep Sea), known as Ultra Space (Japanese: ウルトラスペース Ultra Space) in , is the home dimension of .
In , it is the place where Lusamine is confronted for the final time. The and Lillie reach it through a portal Nebby, now a /, creates after it evolves at the Altar of the Sunne/Altar of the Moone. The player can return to their world to prepare by talking to Solgaleo/Lunala.
==In the core series games==
===History===
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After Lusamine uses Nebby's power against its will to open Ultra Wormholes all over Alola, the one that appeared at the Aether Paradise is connected to Ultra Deep Sea as a comes out. After she's defeated, Lusamine uses the Ultra Wormhole to travel to its world alongside Guzma.
Later on, the player and Lillie travel to Ultra Deep Sea through the powers of the newly-evolved Nebby to retrieve Guzma and Lusamine and save the latter president from herself. Guzma stops them as they proceed forward, warning them of the dangers ahead. When he arrived in Ultra Space, he had tried to capture one of the Ultra Beasts, but it possessed him. Fully aware he was being controlled by something else, Guzma felt fear for the first time in his life. He then tells Lillie that Lusamine is too far gone, but Lillie is not deterred.
Further inside, five of appear in front of Lillie, before dispersing and revealing Lusamine. Lusamine chastises her daughter for intruding on her paradise, but Lillie tries to reason with her but is quickly shut down, told to leave, and disowned by Lusamine. Lillie finally stands up to her mother, saying that children are not just things that belong to parents, and that Pokémon aren't just things that belong to s. Lusamine blames the player for Lillie's defiance, and releases a Nihilego from a Beast Ball, before battling the player with the rest of her Pokémon.
After the player defeats Lusamine, Lillie calls Solgaleo/Lunala to help as the merged Lusamine/Nihilego prepares to attack her. The Legendary Pokémon attacks them, forcing Nihilego and Lusamine apart and sending the Ultra Beast back to its Ball. Exhausted, Lusamine falls to the floor, and Lillie runs to her mother. With the last of her strength, Lusamine asks her daughter when she became so beautiful before losing consciousness. Suddenly, the area grows unstable and Nihilego start surrounding the player, Lillie, Guzma, and Lusamine. Acting fast, Solgaleo/Lunala teleports the group out of Ultra Space before the Nihilego swarms can catch up to them.
It is impossible to return to Ultra Space after defeating Lusamine.
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Ultra Deep Sea can be accessed through Rarity 1 warp holes in Ultra Warp Ride, within a couple of thousand s of Alola.
==Geography==
Ultra Deep Sea is a dark world with many caves that include several colorful rocks in the shape of flora on the walls that resemble diamonds. The area that the player arrives in containes a small pathway that the player can navigate through. Nigilego can be actively seen traveling through the area. There is also a small rocky platform in the middle of the area that the player can sit on to attract the local Nihilego.
==Special encounters==
===Pokémon Ultra Sun and Ultra Moon===
 can be encountered and caught here, with the first being summoned by sitting in the spot Lusamine was seated in . One Nihilego will spawn per visit. Nihilego will appear as ??? and will not be registered as seen in the Pokédex until caught.
Aura: +2
==Trainers==
===Pokémon Sun and Moon===
Each of Lusamine's Pokémon has an aura that boosts one of its stats, similar to the aura seen on the Totem Pokémon. Her Pokémon all have a perpetual angry expression, the same as when a Pokémon uses a Z-Move.
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==In animation==
===Pokémon the Series===
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Ultra Deep Sea first appeared in Rescuing the Unwilling! and 10,000,000 Reasons to Fight!, where and traveled there by riding on in order to save , who had been kidnapped and taken there by a . Upon arrival, the group saw multiple floating around, and soon discovered the one that had kidnapped Lusamine. Unfortunately, the had with Lusamine and was affecting her mental state, causing her to fall into childish tantrums and be unwilling to leave, sending out her Pokémon to battle the group. The group chose to split up to battle each Pokémon, with battling Lusamine's ; , , facing , , and ; taking on ; and facing . Like Lusamine herself, her Pokémon were also under Nihilego's influence, causing them to rise back up even when it seemed like they were finally beaten. Lillie managed to use her Poké Doll to reignite Clefable's memories of their past together, allowing her to return Clefable back to normal.
While his friends stayed behind, Ash pursued Lusamine herself. Eventually, Lillie and Gladion joined him, and Lillie gave her mother a speech which seemed to start breaking her out of Nihilego's influence. Unfortunately, the Parasite Pokémon then took complete control of her, not wanting to let go of its host. As Gladion had already used earlier during his battle with Absol and thus exhausted his chance to use a Z-Move, he left the battle against the Ultra Beast to Ash. Unexpectedly, Ash's Electrium Z suddenly transformed into Pikashunium Z, allowing him and to use a new Z-Move, which Ash dubbed . This massive attack was powerful enough to defeat the Ultra Beast, causing it and Lusamine to be separated and the rest of Lusamine's Pokémon to return to normal as well. Afterwards, everybody rode Nebby back to their own .
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In The Homecoming Crown!, it was revealed that Mohn had wound up in the Ultra Deep Sea after disappearing into an Ultra Wormhole years earlier. He had been rescued by a , who took him back to his own world through another wormhole, exiting it at the Crown Tundra.
==In the manga==
===Pokémon Adventures===
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Ultra Deep Sea first appeared in Adventure in the Dark Dimension. and arrived there after getting separated from in their attempt to rescue after it was possessed by . They spent six months there, only surviving because their bodies stopped needing food and getting sick while they remained in the area. Sometime later, they spotted Lunala arriving at the area, only to find that it was being ridden by Dulse and Zossie of the Ultra Recon Squad. When Sun heard them talking about their work with the Aether Foundation, he assumed them to be enemies and tried to attack them, but Moon managed to calm the situation down. Eventually, Dulse agreed to stay behind so that Sun and Moon could ride Lunala with Zossie and travel to Ultra Megalopolis.
==In the TCG==
==Trivia==
* In , the Rotom Pokédex does not have a map for Ultra Space, does not respond to any input, and does not speak while inside (unless the player requests that it evaluate their Pokédex).
* In Pokémon Sun and Moon, if a , or is evolved here, it will evolve into an , or respectively. However, in , these Pokémon will instead evolve into their Kantonian forms.
* In Sun and Moon, fails if the player tries to use it here. In Ultra Sun and Ultra Moon, using Island Scan anywhere in Ultra Space scans Poni Island.
* In Sun and Moon, the Ultra Deep Sea has a unique background used for battles here, as well as in Pokémon Refresh. In Ultra Sun and Ultra Moon, this background is inexplicably removed and replaced with the generic one used for all locations accessed via Ultra Space (except for Ultra Megalopolis and the Megalo Tower).
** Notably, the upper part of this background is not rendered, and is abruptly cut off at the top as a result. This can be seen if the player uses Pokémon Refresh while in the Ultra Deep Sea.
==In other languages==
Ultra Deep Sea	
Ultra Space
==Related articles==
Category:Inter-dimensional locations
Category:Sun and Moon locations
Category:Ultra Sun and Ultra Moon locations
de:Ultratiefsee
es:Ultraabismo
fr:Ultra-Abysses
it:Ultrabisso
ja:ウルトラディープシー
zh:究極深海