Select Pokémon can Mega Evolve using a newly discovered resource called Mega Energy. You can collect this mysterious substance by completing Mega Raids, which are Raid Battles that feature Mega-Evolved Pokémon. It seems the faster you defeat a Raid Boss, the more Mega Energy you’ll receive for that Pokémon. You can Mega Evolve any of your Venusaur, Charizard, Blastoise, and Beedrill once you have enough of their corresponding Mega Energy! Some of these Pokémon are appearing in Mega Raids too. After you’ve Mega Evolved a Pokémon, the Mega Energy required to Mega Evolve that specific Pokémon will decrease from then onward. Please note that Shadow and Clone Pokémon cannot be Mega Evolved.