These are special items that you can only obtain once which have many purposes, whether that be simply letting you progress in the main storyline, helping you to share experience between Pokémon, cycle around to travel between locations more quickly, or to let you fish for Pokémon.
We have prepared the following list to help you with pointers on where they are all located, now that the games are available on the Nintendo 3DS Virtual Console service.
All Key Item Locations In Pokémon Gold And Pokémon Silver
The Basement Key can be found in Goldenrod City and is required to open a locked door in the Goldenrod City Underground Passage.
The Bicycle is received in Goldenrod City and can be used to double your travelling speed.
The Card Key is given as a reward for rescuing the Director in the Goldenrod City Underground Passage and unlocks the Radio Tower door.
The can be found in the Goldenrod City Underground Passage and allows its owner to hold up to 9,999 coins.
The Dragon Scale can be found on Mortar Mountain or obtained from Wild Pokémon and is used to evolve certain Pokémon.
The Exp. Share can either be received from Mr Pokémon on Route 30 if you trade the Red Scale with him or as a Lucky Number Prize at the Radio Tower and allows the Pokémon that carries it to earn half the experience points given out in battle.
The Expn Card can be found in Lavender Town and is used to listen to Kanto Radio broadcasts.
The Good Rod is received in Olivine City and catches higher-level Pokémon than the Old Rod.
The Itemfinder can be found in Ecruteak City and signals nearby fallen items to its wielder with an alarm sound.
The Lost Item can be found in Vermilion City and is a little girl’s Clefairy Doll. If you return it to her, you will receive a reward.
The Machine Part was stolen from the Power Plant and can be found in Cerulean City. Return it to receive a reward.
The Map Card is received in Cherrygrove City and can be used to view the Map on your PokéGear.
The Mystery Egg can be found on Route 30 and contains a Togepi.
The Old Rod is received on Route 32 and can be used to catch Fish Pokémon.
The Pass can be found in Saffron City and lets you ride the Magnet Train as often as you like.
You receive the Pokédex on Route 30 and, unsurprisingly, it will let you learn more about any Pokémon that you have seen and/or captured.
The Radio Card can be found in the Goldenrod City Radio Tower and will let you use the Radio function on the PokéGear.
The Rainbow Wing can either be found in Goldenrod City in Pokémon Gold or in Pewter City in Pokémon Silver and is required to climb Ecruteak Tin Tower.
The Red Scale can be found at the Lake of Rage and, on Route 30, can be traded with Mr Pokémon for the Exp. Share item.
The S.S. Ticket is given to you by Professor Elm and is required to ride on the S.S. Aqua.
The Secretpotion can be found in Cianwood City and is given to Jasmine in the Olivine Lighthouse to cure Amphy.
The Silver Wing can either be found in Goldenrod City in Pokémon Silver or in Pewter City in Pokémon Gold and is required to make Lugia appear at Whirl Islands.
The Squirtbottle can be found in Goldenrod City and is required to water the Sudowoodo on Route 36.
The Super Rod is received on Route 12 and will provide players with the best chance to catch Fishing Pokémon.
The Unowndex can be found in the Ruins of Alph and unlocks an option in your Pokédex to see which Unown you have collected.