What is the easiest way to get a Sinnoh Stone in Pokemon Go?

There are currently two ways to get a Sinnoh Stone in Pokemon Go.

On the completion of the final day of your 7-day Research Task, also known as a Research Breakthrough.
As reward for winning Trainer Battles — although this is random.

What Pokemon need Sinnoh Stone Pokemon Go? What Pokemon need Sinnoh Stone Pokemon Go? Which Pokémon can use Sinnoh Stone in Pokémon Go? Pre-Evolution Evolution Male Kirlia evolves into Gallade using a Sinnoh Stone and 100 Candy Female Snorunt evolves into Froslass using a Sinnoh Stone and 100 Candy Rhydon evolves into Rhyperior using a Sinnoh Stone...
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Is Sinnoh Stone rare in Pokemon Go? Is Sinnoh Stone rare in Pokemon Go? The Sinnoh Stone is an Evolution Item in Pokémon GO used for evolving particular species of Pokémon. Similar to the rest of the Evolution Items, such as the Dragon Scale or Metal Coat, Sinnoh Stones are extremely rare, making them tricky to obtain....
Does silk touch let you mine stone? Does silk touch let you mine stone? It can acquire these previously non-obtainable blocks: grass block, stone, coal ore, redstone ore, lapis lazuli ore, diamond ore, bookshelves, glass, and ice. Mushroom blocks now drop when mined with Silk Touch....
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