The Pokémon Company confirmed in the latest issue of CoroCoro that Pokémon Let’s Go, Pikachu & Let’s Go, Eevee! will have Mega Evolutions and Team Rocket’s Jessie & James with Meowth. [Thanks, Serebii.]
If a Pokémon has its associated Mega Stone and Key Stone they can Mega Evolve. The magazine shows off three Mega Evolutions with Mega Venusaur, Mega-Charizard X & Y, Mega Blastoise.
In addition to another look at Pewty City Gym Leader Brock and Cerulean City’s Misty, the magazine shared a look at the Vermilion City Gym and its Leader Lt. Surge with Raichu.
Lastly, the magazine reveals Team Rocket’s Jessie, James, and Meowth that appear to get in the way. They’ll also have a couple familiar Poison Type Pokémon such as Ekans and Koffing.