Sinnoh Stone is a special evolution item, exclusive to Pokemon GO, which allows several Gen 1 and 2 species to evolve into their Gen 4 evolution stages. Unlike previous evolution items, the Sinnoh Stone is used for all cross-generation evolutions. Sinnoh stone is only available for Trainers Level 10 and above.
As of the time of writing this guide, it’s known that the Sinnoh Stone is obtained as a drop from your weekly (7 day) field research reward. You can also get Sinnoh Stones from Trainer Battles and Training with Team Leaders.
Pokemon that evolve with Sinnoh Stone
We are listing only Pokemon that are confirmed to evolve with a Sinnoh Stone. We’ve put 100 Candy for all evolution requirements, but we’re not 100% sure for the unreleased evolutions yet.
There are two cross evolutions which are still questionable: Leafeon and Glaceon. Due to Eevee’s random evolution mechanics, it seems that they are not subject to Sinnoh Stone evolution process.