How to Obtain a Sinnoh Stone in Pokemon GO
Participate in Community Day events! They often boost your chances of getting Sinnoh Stones as rewards.
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Just keep doing your weekly research breakthrough tasks. Every seventh day, you get a research breakthrough which has a chance of rewarding you with a Sinnoh Stone.
You can get Sinnoh Stones by completing Field Research tasks and battling in PvP Trainer Battles, specifically when fighting Team Leaders. I got my first one after battling Blanche!
Forget all that, just battle your friends. PvP battles have a good drop rate for Sinnoh Stones!
I've found the best method to be battling the Team Leaders like Spark, Candela, and Blanche. Consistent wins will net you these precious stones.
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