Niantic is continuing to announce new events and content for Pokémon GO on a regular basis. Read on below to learn more:
Hone your catching skills in the Catch Mastery event!
Trainers,
Make like a Fighting-type Pokémon and give your skills a stretch during the Catch Mastery event, featuring Hitmontop, Hitmonlee, and Hitmonchan!
Catch Mastery
Sunday, March 5, 2023, at 10:00 a.m. to 8:00 p.m. local time
Wild encounters
The following Pokémon will appear more frequently in the wild.
Event Bonuses
Field Research task encounters
Tasks focused on your Poké Ball throwing accuracy will be available!
The following Pokémon will be available to encounter when you complete Field Research tasks.
Eggs
The following Pokémon will have a chance to hatch from 7 km Eggs collected during this event.
Timed Research
Timed Research focused on your PokéBall throwing accuracy will be available throughout the event!
Complete 10 sets of research tasks to encounter 40 Hitmontop in total!
Please be aware of your surroundings and follow guidelines from local health authorities when playing Pokémon GO. Upcoming events are subject to change. Be sure to follow us on social media, opt in to receiving push notifications, and subscribe to our emails to stay updated.
—The Pokémon GO team
Source: Official Pokémon GO blog
Pokémon Blog 
4 thoughts on “New Catch Mastery event featuring Hitmontop, Hitmonlee and Hitmonchan will take place in Pokémon GO from March 5 at 10 a.m. to 8 p.m. local time, players will have an increased chance of encountering Shiny Hitmonlee, Shiny Hitmonchan and Shiny Hitmontop”