Pokemon GO's evolution can be as simple as using the required amount of candy, but often rarer evolutions will require an evolution item.
These are consumables that can allow you to not only fill out your Pokedex, but also unlock some impressively powerful creatures.
One such item, the Sinnoh Stone, can make 22 creatures evolve, so it's worth getting hold of.
Here's how to do just that.
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Pokemon GO: How To Get A Sinnoh Stone
There are a few ways to get Sinnoh Stones, but none are guaranteed.
That means you'll want to complete as many of these tasks as possible - especially since you can only use it once.
Arguably the steadiest method of nabbing a stone, you'll need to complete a Field Research task each day for seven days.
At the end, you'll have a chance to earn the Sinnoh Stone, but it's not guaranteed.
Go Battle League Reward
Speaking of PvP, try competing in the Go Battle League for a chance to earn a Sinnoh Stone as a mystery item.
Battling Other Players
You might earn a Sinnoh Stone from battling another player.
Battling Team Go Rocket Leaders
You might earn a Sinnoh Stone from battling a Team Go Rocket Leader.
Pokemon GO Sinnoh Stone Evolutions List
At the time of writing, there are 18 Pokemon which can be evolved from using a Sinnoh Stone.
You'll also need 100 Candy in order to evolve the Pokemon. Some are also dependant on having male or female Pokemon so be sure to check your index.
Full details of which Pokemon you can evolve can be found just below:
How To Find More Special Evolution Items
Want to evolve more unique Pokemon? Some Pokemon in the game can't be caught unless you use a special evolution item.
You'll need a King's Rock for Politoed and Slowking, a Sun Stone for Bellossom and Sunflora, the Dragon Scale for Kingdra, a Metal Coat for Scizor and Steelix, Plus UpGrade for Porygon2.
Want to know more? Follow these guides for your step-by-step walkthrough:
Need More Help? Head to our main Pokemon category for all the latest news and detailed step-by-step guides. Otherwise, make sure you're up to date on the current Egg pool, Ditto Disguises and Field Research Tasks, including the current Spinda you can catch in the wild. If you prefer PVE, you might also fancy your chances tackling the Pokemon Team GO Rocket Leaders - but maybe take a look at our guides to help you counter Arlo, Cliff, Sierra, Giovanni as well as Jessie & James. We've also recently learnt about some of the upcoming Pokemon GO January 2021 Events, including the next January 2021 Community Day and a special New Years Eve Event - So there's plenty to look forward too!