Nihilego is a Pokémon introduced in the seventh generation of the Pokémon series. It is classified as a Rock and Poison-type Pokémon and is known as the "Parasite Pokémon." Nihilego has a unique jellyfish-like appearance, with a translucent body and a distinct, glowing head. It is part of the Ultra Beasts, a group of powerful and mysterious creatures from another dimension. In the Pokémon games, Nihilego is often associated with the Ultra Wormholes, which serve as portals to alternate realities. Trainers can encounter Nihilego during specific events or battles, and it plays a significant role in the storyline of the Pokémon Sun and Pokémon Moon games.