Niantic Labs has announced Pokemon Go players can look forward to something special next week. Players will find that Eggs received from Gifts will contain select Alolan and Galarian forms hatching from all 7 km Eggs. It all starts when the Throwback Challenge event ends on Monday, June 8 at 1pm local time. During this time, the following Pokemon will be the only ones hatching from 7 km Eggs:
Galarian Meowth Galarian Zigzagoon Galarian Darumaka Galarian Stunfisk Alolan Rattata Alolan Sandshrew Alolan Vulpix Alolan Diglett Alolan Meowth Alolan Geodude Alolan Grimer
When the event ends was not stated, so grab those Pokemon while you can.