Record Corner (FireRed/LeafGreen)
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
See also:
S.S. Anne Ship Truck
In Pokémon FireRed and LeafGreen, the Pokémon Cable Club Record Center from Pokémon Ruby and Sapphire exists as an unused map due to the removal of the record mixing feature. Stepping on the tiles used to trigger the feature causes the game to lock up as the relevant code has been deleted. The nurse's sprite was updated but interacting with her yields nothing.
In Pokémon Emerald, the map reappears as the Record Corner.
External links
[1] - YouTube video of a player entering the Pokémon Cable Club Record Center in Pokémon FireRed and LeafGreen.