Pokémon Go ‘Noxious Swamp’ event, Timed Research guide
The Pokémon Go “Noxious Swamp” event adds shiny Skrelp, Timed Research, and other perks. Our guide lists them all out.
This article references relevant content from the polygon.com website. Original article link: [https://www.polygon.com/pokemon-go-guide/2023/8/19/23837178/noxious-swamp-timed-research-shiny-skrelp]

As a tie-in to Pokémon Go Fest 2023 in New York City, there’s an in-game event boosting the appearance of poison- and dragon-type Pokémon, with a focus on Skrelp. “Noxious Swamp” runs from Aug. 19-22.
Thanks to the event, Skrelp’s shiny form has been added to Pokémon Go. Candy obtained from catching Pokémon throughout the event will be doubled, Team Go Rocket balloons will appear more frequently, and and you’ll get an additional free raid pass per day from spinning the disks at gyms.

There are several other bonuses, like Timed Research, which you can check out below.
Pokémon Go ‘Noxious Swamp’ Timed Research
Reward: Jangmo-o encounter, 50 Salamence Mega Energy, 50 Sceptile Mega Energy