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Nihilego (ウツロイド, Utsuroido) (codenamed UB-01 Symbiont) is a Rock/Poison-type Pokémon introduced in Generation VII. It is an Ultra Beast, one of the several species of Pokémon native to Ultra Space.



Nihilego's exact bodily functions are unknown, however, it is known to be somewhat parasitic in the sense that it's much stronger when it has a host. Its also not known what exactly its tissue is made of, but according to several official sources, it's said to be made up of a glass-like material that is flexible like rubber. As such, it is a genderless Pokémon. It somehow resembles a jellyfish.

Natural abilities

As implied by its title of Symbiont, Nihilego is specialized towards influencing other Pokémon to protect itself and its nests. It generates a neurotoxin that simultaneously gives those injected with it great power while reducing their inhibitions and sending them into an agitated, often violent state. The ultimate goal of this is for the infected Pokémon to attack and destroy any natural competitors for itself and the Nihilego. It is heavily implied that the violent behavior of other Ultra Beasts is due to acting under the influence of Nihilego venom.


Nihilego doesn't evolve.

Game info

Game locations

Version(s) Area(s) Rarity
Sun and Moon Wela Volcano Park/Diglett's Tunnel (post-game side quest) One
Ultra Sun and Ultra Moon Ultra Deep Sea One per visit
Sword and Shield Trade None
The Crown Tundra
Dynamax Adventures One

Pokédex entries

  • Sun

    One of several mysterious Ultra Beasts. People on the street report observing those infested by it suddenly becoming violent.

  • Moon

    One of the Ultra Beasts. It’s unclear whether or not this Pokémon is sentient, but sometimes it can be observed behaving like a young girl.

  • Ultra Sun

    A life-form from another world, it was dubbed a UB and is thought to produce a strong neurotoxin.

  • Ultra Moon

    It appeared in this world from an Ultra Wormhole. Nihilego appears to be a parasite that lives by feeding on people and Pokémon.


Standard form

Nihilego's Stats
Sp. Atk
Sp. Def



LevelingGeneration VII
Level Move Power Accuracy PP Type Category
1 Power Split —% 10 Psychic Status
1 Guard Split —% 10 Psychic Status
1 Tickle 100% 20 Normal Status
1 Acid 40 100% 30 Poison Special
1 Constrict 10 100% 35 Normal Physical
1 Pound 40 100% 35 Normal Physical
7 Clear Smog 50 —% 15 Poison Special
13 Psywave 100% 15 Psychic Special
19 Headbutt 70 100% 15 Normal Physical
23 Venoshock 65 100% 10 Poison Special
29 Toxic Spikes —% 20 Poison Status
31 Safeguard —% 25 Normal Status
37 Power Gem 80 100% 20 Rock Special
43 Mirror Coat 100% 20 Psychic Special
47 Acid Spray 40 100% 20 Poison Special
53 Venom Drench 100% 20 Poison Status
59 Stealth Rock —% 20 Rock Status
67 Wonder Room —% 10 Psychic Status
73 Head Smash 150 80% 5 Rock Physical
Bold indicates this Pokémon receives STAB from this move.
Italic indicates an evolved or alternate form of this Pokémon receives STAB from this move.


TMs, TRs, and HMs Generation VII
TM/HM/TR Move Power Accuracy PP Type Cat.
TM03 Psyshock 80 100% 10 Psychic Special
TM06 Toxic 90% 10 Poison Status
TM09 Venoshock 65 100% 10 Poison Special
TM10 Hidden Power 60 100% 15 Normal Special
TM16 Light Screen —% 30 Psychic Status
TM17 Protect —% 10 Normal Status
TM20 Safeguard —% 25 Normal Status
TM21 Frustration 100% 20 Normal Physical
TM24 Thunderbolt 90 100% 15 Electric Special
TM25 Thunder 110 70% 10 Electric Special
TM27 Return 100% 20 Normal Physical
TM29 Psychic 90 100% 10 Psychic Special
TM32 Double Team —% 15 Normal Status
TM33 Reflect —% 20 Psychic Status
TM34 Sludge Wave 95 100% 10 Poison Special
TM36 Sludge Bomb 90 100% 10 Poison Special
TM37 Sandstorm —% 10 Rock Status
TM42 Facade 70 100% 20 Normal Physical
TM44 Rest —% 10 Psychic Status
TM48 Round 60 100% 15 Normal Special
TM49 Echoed Voice 40 100% 15 Normal Special
TM57 Charge Beam 50 90% 10 Electric Special
TM59 Brutal Swing 60 100% 20 Dark Physical
TM73 Thunder Wave 90% 20 Electric Physical
TM84 Poison Jab 80 100% 20 Poison Physical
TM86 Grass Knot 100% 20 Grass Special
TM87 Swagger 85% 15 Normal Status
TM88 Sleep Talk —% 10 Normal Status
TM90 Substitute —% 10 Normal Status
TM92 Trick Room 100% 5 Psychic Status
TM99 Dazzling Gleam 80 100% 10 Fairy Special
TM100 Confide —% 20 Normal Status
Bold indicates this Pokémon receives STAB from this move.
Italic indicates an evolved or alternate form of this Pokémon receives STAB from this move.


Nihilego learns no moves via breeding.


Tutoring Generation VII
Move Power Accuracy PP Type Category
Ally Switch USUM —% 15 Psychic Status
Bind USUM 15 85% 20 Normal Physical
Foul Play USUM 95 100% 15 Dark Physical
Gunk Shot USUM 120 80% 5 Poison Physical
Iron Head USUM 80 100% 15 Steel Physical
Knock Off USUM 65 100% 20 Dark Physical
Magic Coat USUM —% 15 Psychic Status
Pain Split USUM —% 20 Normal Status
Role Play USUM —% 10 Psychic Status
Snore USUM 50 100% 15 Normal Special
Spite USUM 100% 10 Ghost Status
Stealth Rock USUM —% 20 Rock Status
Telekinesis USUM —% 15 Psychic Status
Wonder Room USUM —% 10 Psychic Status
Worry Seed USUM 100% 10 Grass Status
Zen Headbutt USUM 80 90% 15 Psychic Physical
Bold indicates this Pokémon receives STAB from this move.
Italic indicates an evolved or alternate form of this Pokémon receives STAB from this move.




  • As Nihilego is said to be the one who actually caused Lusamine to become evil, Nihilego is the first Pokémon without a trainer who is an antagonist.
    • It is also the first Pokémon to actually be fought as a trainer in the games after fusing with Lusamine.
  • Lillie's original appearance is based on Nihilego's appearance, as per request of her mother, Lusamine.
  • Despite being based on a jellyfish, it is weak to Water-type attacks.
  • Nihilego is the only Ultra Beast with a unique type combination that no other Ultra Beast or Pokémon has.
  • Nihilego's abilities are very similar to the Symbiotes'.


Nihilego is based on a jellyfish. Its mind-numbing poison may be based on the neurotoxin produced by the Portuguese man-o-war. Its appearance mostly pulls inspiration from the glass jellyfish, hence the Rock-type. It being a parasitic jellyfish may be a reference to Nintendo's Metroid series of video games, in which the titular creatures are alien parasites which typically resemble jellyfish and attack by latching on to their victim's head (though, ironically, their Rock-typing makes them strong against Ice-type attacks, whereas Metroids are typically weakened by ice) and/or to myxozoans, parasitic animals closely related to jellyfish. With the theory that the original seven Ultra Beasts are based on the Seven Deadly Sins, Nihilego may be based on the sin of envy, as it usually takes over others and uses neurotoxins that have similar effects to Id, an instinctual drive that forces those to seek what they desire, even if it means taking or wanting the pleasures owned by others. Its English name, mind-control abilities, extradimensional nature, and the appearance of its homeworld may also be in reference to the Nihilanth, a being capable of mind control that came from a parallel world called Xen that serves as the final boss of the first Half-Life game.


Nihilego is a combination of nihilist (a person who believes all life is meaningless and that there is no God), nihil (Latin for "nothing"), ego (the mind space in which there is separation between consciousness and unconsciousness), and geode (referring to its part Rock-typing and its see-through appearance).

Utsuroido is likely derived from 虚 (utsuro, empty), 移ろい (utsuroi, moving from host to host) void, Id, -oid (a suffix meaning "of similar form", referencing its resemblance to Lillie), and possibly Metroid.