Unlike the Sinnoh Stone, however, the Unova Stone won't be used to evolve Pokémon from previous generations. Instead, it will be used to complete many of those introduced in Gen 5.
The Unova Stone is one of many special evolution items in Pokémon Go, including the King's Rock for Slowking and Politoed, the Metal Coat for Steelix and Scizor, the Up-Grade for Porygon 2 and the Dragon Scale for Kingdra.
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How to get a Unova Stone in Pokémon Go
Thanks to Chrales from Twitter, we first learned of the Unova Stone through a leak and, from its description, we know that it can "make certain species of Pokémon evolve."
Similar to the Sinnoh Stone, it is possible (but not guaranteed) to receive a Unova Stone by:
It is possible more Unova Stone sources will be rolled out over time - Sinnoh Stone can also be found by defeating fellow trainers in PVP Trainer Battles, for example.
Until then, completing those seven day Field Research rewards is the way to source those Unova Stones.
The World of Wonders season has come to Pokémon Go, giving you the chance to catch Poipole. Don't forget to try out Routes, Gift Exchange and Party Play while you're hunting down rare Pokémon, fighting in the Go Battle League or competing in PokéStop Showcases.
Which Pokémon can use Unova Stone in Pokémon Go?
Gen 5 has a range of Pokémon that have special conditions to their evolutions, including the use of Stones that aren't available in Pokémon Go, of which are replaced with the Unova Stone in Pokémon Go.
Here are the current available uses of a Unova Stone in Pokémon Go:
Other Stone-based evolutions - such as Gen 5's Cottonee and Petilil - have been confirmed to use a Sun Stone.