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Metal Sound (move)
From Bulbapedia, the community-driven Pokémon encyclopedia.
The two horns on Aggron's head starts to glow white and they move back and forth quickly, causing a loud ringing sound to be released. The horns then release light blue sound waves from them at the opponent, lowering their special defense. Any Pokémon that hears the sound gets a loud ringing sound that echoes in their ears as well.