Items, Event items, #445
Secret Key appears in 11 version groups since Generation I, an Event items item in the Key Items pocket
PokéAPI item 445 of 2,223, Event items category, Key Items pocket
Effect, in PokéAPI's words
Secret Key: “Gen IV: The key to Rotom’s appliance room. Gen III: The key to Cinnabar Gym.”
Used by trainer in the Galactic Eterna Building, on the ground floor, to the left of the TV: Unlocks the secret Rotom room, in which there are five appliances which can change Rotom’s form.
Games
Secret Key is listed in the text of 11 version groups, first in Generation I
Game index by generation
IIIIIIIVVVIVIIVIIIIX
Named in
EmeraldFireRed and LeafGreenPlatinumHeartGold and SoulSilverBlack and WhiteBlack 2 and White 2X and YSun and MoonUltra Sun and Ultra MoonLet's Go Pikachu and Let's Go EeveeSword and Shield