Pokemon Let's Go Pikachu and Let's Go Eevee will indeed have Mega Evolutions.
The information originally came from the recent issue of CoroCoro, which leaked online this week. Scans of the magazine, shared on Serebii.net, confirmed that Mega Evolutions are in.
In the scans, Blastoise's, Charizard's, and Venusaur's Mega Evolutions are shown. These Evolutions can be activated when you have the appropriate Mega Stone for any of these Pokemon, as well as a Key Stone (via Nintendo Everything).
This makes the appearance of these Mega Evolutions the first in the Kanto region where the game takes place.
You'll also note that the scans feature the Vermilion City Gym, as well as an updated look at Lt. Surge who will once again have a Raichu.
After news broke regarding Mega Evolutions, Nintendo released a trailer showing how it works in the Let's Go games. The video also takes a look at Lt. Surge, Team Rocket, and Vermilion City.
The company also provided a breakdown of the features, whci we've posted below.
Don’t Just Evolve—Mega Evolve
- In Pokemon: Let’s Go, Pikachu and Pokemon: Let’s Go, Eevee, players will be able to Mega Evolve a Pokemon once per battle if they have a Key Stone and the Mega Stone corresponding to that specific Pokemon. Mega Evolution, known as “the Evolution that transcends Evolution,” momentarily unleashes the energy within a Pokemon and can only be accomplished when a strong bond exists between the Pokemon and its Trainer. The first three Pokemon that fans will be able to Mega Evolve during their adventure will be Venusaur, Charizard, and Blastoise.
Explore Iconic Kanto Region Location Vermilion City
- Pokemon: Let’s Go, Pikachu and Pokemon: Let’s Go, Eeveee will bring players to a variety of interesting locations in the Kanto region, including Vermilion City, where the luxury cruise liner the S.S. Anne docks once a year. In the Vermilion City Pokemon Gym, players can battle Gym Leader Lt. Surge, who is also known as the Lightning Lieutenant.
Here Comes Team Rocket
- Team Rocket, a nefarious organization set on using the world’s Pokemon in despicable plots to make money, is another example of the diverse cast of characters that players will encounter in Pokemon: Let’s Go, Pikachu and Pokemon: Let’s Go, Eevee. This includes the most famous members of Team Rocket—Jessie, James, and Meowth.
Pokemon Let’s Go Pikachu and Let’s Go Eevee release November 16 on Nintendo Switch.