https://www.polygon.com/2018/10/24/18018298/pokemon-go-meltan-evolution-how-to-evolve-melmetal

It turns out that Meltan, the adorably small mythical Pokémon that’s exclusive to Pokémon Go, has an evolutionary form. The latest video in the Professor Oak/Professor Willow saga, released in anticipation of Pokémon: Let’s Go!, introduces Melmetal — the first legendary Pokémon evolution in the franchise.

Unlike Meltan, which is only eight inches in height, Melmetal is over eight-feet tall. It also weighs nearly 2,000 pounds — which, in the clip, freaks out Oak and Willow, who aren’t ready to transfer something that big between the Pokémon Go and Pokémon: Let’s Go! universes.