The Pokémon Company and Niantic have announced that Mega Evolutions are coming to Pokémon Go. Mega Evolutions were first introduced in Pokémon X & Y on 3DS, but were phased out for Sun & Moon and Sword & Shield. Now, they return to deliver new gameplay opportunities in Pokémon Go battles.
Mega Evolutions allow certain Pokémon to temporarily evolve into more powerful forms during battles. Only select Pokémon can Mega Evolve and currently there are more than 40 Pokémon species that can Mega Evolve, including Blastoise, Gyarados, and Salamence. In addition, Charizard and Mewtwo each have two Mega Evolutions in the main games, but there's no word on how that will be determined in Pokémon Go.
In addition, to celebrate the launch of Pokémon Sword & Shield's first expansion, The Isle of Armor, Galarian Farfetch'd is now appearing in Pokémon Go. Pokémon Go players will also receive special avatar items based on the clothing your trainer wears in the Pokémon Sword & Shield expansions.