Unused map locations | Early English promotional Pokémon names | Eternal Flower Floette | Bird type | Unused music | Unused encounter system (Yellow) | Unused Bulbasaur slot machine symbol | Unused Shadow Pokémon | Cacophony | Unused Japanese list strings (Generation I) | Unused items | Unused Pokémon data | Unused and redundant Egg moves
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|Bulbapedia also has an article about Cacophony.|
Cacophony (Japanese: そうおん, Noise) is an unused Ability in Pokémon Ruby and Sapphire, Pokémon FireRed and LeafGreen, and Pokémon Emerald that is identical to Soundproof.
It is theorized that Cacophony was originally intended for the Whismur evolutionary line as it was featured in the Exploud (Great Encounters 17) card of the Pokémon Trading Card Game under the same Japanese name.