Pokemon Go Holiday 2018 Dates and Bonuses

Niantic announced a brand new holiday event for Pokemon Go, offering a variety of in-game awards for a limited time.
Different bonuses will be in effect from December 18th to January 2nd. Here’s the full breakdown for Pokemon Go Holiday 2018:
Dec. 18 – Jan. 2: Ice-type Pokemon are more common in the wild. Holiday hat Pikachu is available to catch. Smoochum, Azurill, Munchlax and more can be hatched from 7 km Eggs. Players can earn a free single-use Egg Incubator one per day by spinning the Photo Disc at a PokeStop.
Dec. 18 – Dec. 22: Earn double Candy from catching and transferring Pokemon.
Dec. 22 – Dec. 26: Earn double Stardust from catching Pokemon.
Dec. 26 – Dec. 30: Earn double XP from catching Pokemon.
Dec. 30 – Jan. 2: Egg Incubators have double the hatching rate.
 
In addition, you’ll be able to get new outfits and accessories themed after Delibird from the in-game Style Shop starting December 18.
In other news, players are able to challenge the Legendary Pokemon Lugia and Ho-Oh in Raid Battles from now until December 17th at 1 p.m. PST, according to Niantic. There’s even a chance of catching their shiny forms.
For more Pokemon Go news, guides and more, check out Heavy.
See also:

How to Get the Mystery Box for Meltan in Pokemon Go
Pokemon Go Field Research List for December 2018
How to Connect PokeBall Plus & Other FAQs