Niantic has announced that a Limited Research featuring Nidoran♀ and Nidoran♂ will be available on Saturday, November 28th, 2020, from 8:00 a.m. to 10:00 p.m. local time.

November Limited Research featuring Nidoran♀ and Nidoran♂ is coming soon!

Trainers, This month, look forward to a Limited Research event featuring Nidoran♀ and Nidoran♂!

On Saturday, November 28, 2020, from 8:00 a.m. to 10:00 p.m. local time, you can complete event-exclusive Field Research tasks to earn encounters with Nidoran♀ and Nidoran♂. If you’re lucky, you might even encounter a Shiny Nidoran♀ or a Shiny Nidoran♂! You can also look forward to event-exclusive Timed Research.

Please be aware of your surroundings and follow guidelines from local health authorities when playing Pokémon GO. Upcoming events are subject to change.

Source: https://pokemongolive.com/post/limitedresearch-nov2020/?hl=en