Blacephalon

Blacephalon (ズガドーン) (codenamed UB Burst) is a /-type Pokémon introduced in Generation VII. It is an Ultra Beast exclusive to Pokémon Ultra Sun.

Pokédex entries
A UB that appeared from Ultra wormhole, it causes explosions, then takes advantage of opponents' suprise to rob them of their vitality

Origin
It has some characteristics of fireworks. It is also based on a clown.

Etymology
"Blacephalon" Is possibly a play on the word "Blasphemy", "Blaze" or "Blast", and the greek Word Cephalos (κεφαλος) which means Head.