http://www.newsweek.com/pokemon-go-halloween-raid-update-1184590

Pokémon Go ’s annual Halloween event is live and with it comes new Raid Bosses for trainers to battle and catch.

While the highlight of the new bosses is Giratina, the Ghost and Dragon-type Legendary Pokémon from the Sinnoh Region, there are others that share the ghostly theme of Halloween. These changes began with the update on Oct. 23 at 4 p.m. EDT and are likely to stay until at least Nov. 1.