Pokémon Go ‘Winter Holiday Part 1’ event, Timed Research guide
The first part of this year’s Pokémon Go holiday event includes the addition of Mega Glalie, shiny Bergmite, and some paid Timed Research.
This article references relevant content from the polygon.com website. Original article link: [https://www.polygon.com/pokemon-go-guide/2022/12/15/23511117/winter-holiday-part-1-event-timed-research-shiny-avalugg-rewards-ticket]

Pokémon Go’s first holiday season event, “Winter Holiday Part 1,” has launched. It’ll run from Dec. 15-23.
The event introduces Mega Glalie to the game, as well as Bergmite’s shiny form. Many holiday costumed Pokémon from previous years’ holiday events have also returned, so you can grab them throughout the event to flesh out your collection.

We list out all the event perks below, including the paid Timed Research.
Winter Holiday Timed Research and rewards
This Timed Research is only available to players who buy a pass for $5 in the shop. The research expires on Dec. 31 at 8 p.m. in your local time.
Rewards: Sneasel encounter, 1 Incense, 50 Abomasnow Mega Energy
Rewards: Galarian Mr. Mime encounter, 1 Egg Incubator, 50 Abomasnow Mega Energy
Rewards: Galarian Darumaka encounter, 1 Egg Incubator, 50 Abomasnow Mega Energy
Rewards: Galarian Mr. Mime encounter, Gifting Pose cosmetic