In 2019, Pokémon GO introduced the concept of Limited Research Days. These are days where, for three hours, a certain event exclusive piece of Field Research will be available for players. This research is then forever with the player. Each region has the event at different times. Click the Limited Research Day for more details

PictureNameDurationFocus
Weather DayWeather Day March 30th 2018 Lotad
Clamperl DayClamperl Day February 23rd - February 24th 2018 Clamperl
Feebas DayFeebas Day January 19th - January 20th 2018 Feebas