A leak for this month’s issue of CoroCoro has made its way online. It’s quite interesting as Mega evolutions will be available in Pokemon: Let’s Go, Pikachu / Eevee.
This means that Key stones and Mega Stones will feature in the game and will allow players to Mega evolve their Pokémon. This feature was never available in Pokémon Yellow so being able to Mega Evolve Pokémon in the Kanto region will be quite a unique experience.
In the same issue, CoroCoro also shows Images of Gym Leaders Brock, Misty and Vermilion City Gym Leader Lt. Surge. Lt. Surge also has his signature Raichu again.
Source: Serebii