Niantic has announced that starting on Monday, June 8th, 2020, at 1:00 p.m. local time, certain Pokémon’s Alolan and Galarian forms will hatch from 7 km Eggs.

Certain Pokémon’s Alolan and Galarian forms will soon hatch from 7 km Eggs

Trainers, It appears something strange will be happening to the Eggs you can receive from Gifts—certain Pokémon’s Alolan and Galarian forms will be hatching from all 7 km Eggs! We aren’t sure how long this phenomenon will last, but we can assure you that Professor Willow is on the case.

When the Throwback Challenge event ends on Monday, June 8, 2020, at 1:00 p.m. local time, the following will be the only Pokémon hatching from 7 km Eggs until further notice.

Source: https://pokemongolive.com/en/post/7kmeggs-alolan-galarian-forms/