Niantic have announced the details for the May 2020 Research Breakthrough encounter and Pokémon Spotlight Hours for Pokémon GO.

May’s Research Breakthrough encounter and Pokémon Spotlight Hours

Trainers, Here’s an update on what you can look forward to this month.

Team GO Rocket Special Research update
It seems that Team GO Rocket has been quiet lately, so from May until the end of September, there’ll be no new Team GO Rocket Special Research available. Professor Willow and the team find this very odd and will continue to investigate to see if they can find any leads. We hope this means this is the last we’ll see of Team GO Rocket, but knowing the capabilities of these villains, we highly doubt that’s the case! Stay tuned for any updates. We really don’t expect Team GO Rocket to be quiet all summer...

May Research Breakthrough encounter: Shinx with bonus Shinx Candies!
From Friday, May 1, 2020, at 1:00 p.m. to Monday, June 1, 2020, at 1:00 p.m. PDT (GMT −7), the Flash Pokémon, Shinx, will be available as a Research Breakthrough encounter, and it’ll come with bonus Shinx Candies!

Upcoming Pokémon Spotlight Hours
In the next few weeks, Pokémon Spotlight Hour will take place every Tuesday at 6:00 p.m. local time and will continue to spotlight both a Pokémon and a special bonus! For each Pokémon Spotlight Hour, you can expect a different Pokémon and bonus.

• Tuesday, May 5, 2020: Shellder will be in the spotlight, and you’ll earn twice the Stardust for catching Pokémon.
• Tuesday, May 12, 2020: Sunkern will be in the spotlight, and you’ll earn twice the XP for catching Pokémon.
• Tuesday, May 19, 2020: Poochyena will be in the spotlight, and you’ll earn twice the Candy for catching Pokémon.
• Tuesday, May 26, 2020: Bronzor will be in the spotlight, and you’ll earn twice the Candy for transferring Pokémon.

Please be aware of your surroundings when playing Pokémon GO. Upcoming events are subject to change.

Source: https://pokemongolive.com/en/post/may2020/