Trainers, the Sinnoh Stone has joined other evolution items as a potential reward for Research Breakthroughs.
There will be more ways to get the Sinnoh Stone in the future, stay tuned to our official channels for updates.
https://twitter.com/NianticHelp/status/1068308950217621504
なんて言ってるの？
https://twitter.com/5chan_nel (5ch newer account)