From Bulbapedia, the community-driven Pokémon encyclopedia.
Heavy Metal (Japanese: ヘヴィメタル Heavy Metal) is an Ability introduced in Generation V.
Doubles the weight of the Pokémon with this Ability.
Autotomize is applied before other weight-modifying effects, including Heavy Metal. Heavy Metal is the only effect that can cause a Pokémon's weight to exceed 999.9 kg.
This has no effect on the Heavy Ball, which uses the Pokémon's species' weight rather than its current weight.
Outside of battle
Heavy Metal has no effect outside of battle.
Pokémon with Heavy Metal
In other games
In Pokémon UNITE, Heavy Metal is Duraludon's Ability. It prevents the user from being thrown or shoved by the first attempt to throw or shove them.
In other languages