It appeared in this world from an Ultra Wormhole. Nihilego appears to be a parasite that lives by feeding on people and Pokémon.
Nihilego is a Rock/Poison-type Pokémon. It takes double damage from Water, Psychic and Steel, quadruple damage from Ground, and resists six types. Its base stats add up to 570: the highest is Special Defense (131) and the lowest is Defense (47).
It does not evolve, and no other Pokémon evolves into it. Its ability is Beast Boost. It cannot breed: it is in the Undiscovered egg group. In Sword and Shield it learns 17 moves by level-up and 39 by TM.
BASE STATS
EVs on defeat:
Sp. Def +3
ABILITIES
The Pokémon boosts its most proficient stat each time it knocks out a Pokémon.
BREEDING
MOVES
WEAKNESSES & RESISTANCES
EVOLUTION LINE
This Pokemon does not evolve