Melmetal is a large, silver Pokémon with a vaguely humanoid build that consists mostly of liquid metal. Many dark-gray hexagonal nuts are embedded in or attached to its body: one around each shoulder, one around the center of each arm, one in each hand, one in each foot, and a small light gray one in the center of its torso. A large, golden hexagonal nut encircles its neck and a smaller one acts as its head. Floating in its head is a small, dark gray sphere which may be oscillated. It has a small red tail resembling an electrical wire.

Melmetal is a Pokémon that has come back to life after 3,000 years. In ancient times, it was worshiped for its ability to create metal from nothing. According to Professor Willow, Melmetal lived in a secluded area deep within a wooded land that was full of sedimentary rocks rich with magnetite, and its shed metal was used by ancient people to create unique metal tools. The process of evolution has hardened its body, making it incredibly sturdy. However, it is still in a liquid state and has some flexibility, particularly in its heavy hex nut arms. Melmetal applies centrifugal force on its arms, allowing it to have the strongest punches of all Pokémon. When it attacks, the nuts encircling its arms slide down as if to bulk up its fists. Melmetal is said to be created when one strong Meltan absorbs the group it lives with in order to evolve. When Melmetal reaches the end of its life, it will rust and break down into small shards, from which new Meltan will be born.

Forms

Melmetal has a Gigantamax form.

As Gigantamax Melmetal, it becomes a large cyclopean giant, told in legends. The dark-gray hexagonal nuts are now embedded as five fingers for its hands, two for the feet, two underneath the shoulder, and two connecting the shoulder to a large golden nut at the center of its chest. A silver hexagonal nut is located on its abdomen, and it has a large red tail resembling an electrical wire located behind it. The head is shaped like a knight's helmet with three red clouds surrounding it. Inside is a smaller golden hexagonal nut, with a glowing red and gray sphere floating in the center of it.

In its Gigantamax state, Melmetal can use its elastic and flexible body to land punches at foes while keeping its distance. By bringing the hex nuts on its fists together, it can create gigantic fists for an even bigger punch. Gigantamax Melmetal can release tremendous electric beams from its belly, capable of vaporizing opponents and even an entire hill. The electricity is generated by the flow of liquid metal stored in Gigantamax Melmetal's body.

Evolution

Melmetal evolves from .

(Source: Bulbapedia)