New content has been added to the main story’s Mysterious Stones chapter! You’ll need to collect 100 total mysterious stones to unlock the newest story, Similarities to Sync Stones.

New content added to the Mysterious Stones chapter!

Added new content to the Main Story’s Mysterious Stones Chapter.

Note: The story added this time will be Similarities to Sync Stones.

Collect Mysterious Stones

Gathering the required number of Mysterious Stones will unlock the Mysterious Stones Chapter. After acquiring a total of 100 Mysterious Stones, you will unlock Similarities to Sync Stones.

Note: The number of Mysterious Stones needed to unlock an area is based on the total number of stones you have acquired.
Note: If you have not acquired enough Mysterious Stones to unlock an area, you can check the area to see how many Mysterious Stones it requires and how many you have acquired in total.

Where to Find Mysterious Stones

Mysterious Stones can be obtained as completion rewards from all of the Daily Region Rotation battles, and there is also a small chance of receiving them from Trainer Lodge expeditions. You may also receive them randomly from some area info in the Training Areas.

Important

• To unlock the Main Story Mysterious Stones Chapter, you must have acquired one Mysterious Stone.
• We plan to release more updates to the Mysterious Stones Chapter story in the future.
• The content is subject to change without notice.

Source: https://pokemonmasters-game.com/en-US/announcements/Update_5110_1W_3