One of several mysterious Ultra Beasts. People on the street report observing those infested by it suddenly becoming violent.
– Pokémon Moon Pokédex
Hit the jump for more on Nihilego
Happy New Year!
It slithers toward people. Then, without warning, it triggers the explosion of its own head. It’s apparently one kind of Ultra Beast.
– Pokémon Ultra Sun Pokédex
Hit the jump for more on Blacephalon