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Sinnoh Stones, unfortunately, aren’t as easy to obtain in Pokémon GO as some of the other items in the game are, making them a tough find.
One way to get a Sinnoh Stone is to complete a Field Research task every day for seven days. When you reach the seventh day, you’ll be rewarded with a free item, and there’s a small chance that item will be a Sinnoh Stone. Of course, this doesn’t leave you with very high odds, so this isn’t the most reliable method to obtain them.
Source: https://www.distractify.com/p/how-to-use-a-sinnoh-stone-in-pokemon-go
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