How to get the Sinnoh Stone in Pokémon Go
Niantic has angered some Pokemon Go players earlier today by introducing a brand new Evolution item to stop trainers from instantly obtaining a whole bunch of Sinnoh Pokédex Pokémon.
This item, known as the "Sinnoh Stone", allows players to evolve generation one to three Pokémon that gained an additional evolution in the fourth generation of Pokémon games. Once they have the stone and 100 candy for the Pokémon they are trying to evolve.
These Pokémon you can get with the Sinnoh Stone include Rhyperior, Electivire, Magmortar, Togekiss, Mismagius, Honckrow, Weavile, Dusknoir, Roserade, Gliscor, Porygon-Z.
To get the Sinnoh Stone, the only way to get one at the moment is to complete a research breakthrough, which is the reward you get from completing seven day's worth of research tasks to unlock a special encounter at the end.
There is currently no other way to get the stone and with so many new Pokémon available, trainers might need to work through the winter to unlock them all.