Shiny Charm appears in 6 version groups since Generation V, a Gameplay item in the Key Items pocket
PokéAPI item 675 of 2,223, Gameplay category, Key Items pocket
Effect, in PokéAPI's words
Shiny Charm: “Raises the chance of finding a shiny Pokémon.”
Games
Shiny Charm is listed in the text of 6 version groups, first in Generation V
Game index by generation
IIIIIIIVVVIVIIVIIIIX
Named in
Black 2 and White 2X and YSun and MoonUltra Sun and Ultra MoonLet's Go Pikachu and Let's Go EeveeSword and Shield