Serebii (Unofficial) (@serebii)

Serebii Update: The Pokémon Scarlet & Violet Mighty Hydreigon Tera Raid Battle Event has begun its second run, with Blissey returning as additional raids.

Runs until November 16th at 23:59 UTC

Full details @ www.serebii.net/scarletviolet/teraraidbattles/event-mightyhydreigon.shtml