Meltan is a Steel-type Mythical Pokémon introduced in Generation VII in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!.
In Pokémon GO, it evolves into Melmetal by using 400 Meltan Candy. It cannot be evolved in other games.
Its appearance was first teased during the September Pokémon GO Community Day on September 22, 2018, and it was officially revealed on September 25, 2018.
Its body can corrode metal, which it then absorbs. Meltan can generate electricity using the metal it absorbs, and then fire it from its eye. According to Professor Willow, Meltan has been described in ancient texts found in the same place as the Mystery Box, a mysterious item that attracts Meltan to its location when opened. Professor Willow also states that Meltan is said to be created from small shards when a Melmetal rusts and splits apart. Meltan is known to live in groups until the day comes where one strong Meltan absorbs the group to evolve into Melmetal.
As seen in the anime, the hexagonal nut on its body can be removed. It has also been seen working in packs. When provoked, it will spin its head, creating a sound that calls others of its own kind. This head-spinning can also be used as a sign of affection. The anime has also shown Meltan can be tamed if fed metal-like treats. Meltan can also multiple in numbers overtime as seen in the anime. Meltan is one of the smallest Pokémon, tying with Alolan Diglett and Klefki as the shortest Steel-type.