Contest Pass appears in 13 version groups since Generation III, a Gameplay item in the Key Items pocket
PokéAPI item 434 of 2,223, Gameplay category, Key Items pocket
Effect, in PokéAPI's words
Contest Pass: “Allows participation in Pokémon Contests.”
Allows the trainer to enter Contests.
Games
Contest Pass is listed in the text of 13 version groups, first in Generation III
Game index by generation
IIIIIIIVVVIVIIVIIIIX
Named in
Ruby and SapphireEmeraldFireRed and LeafGreenDiamond and PearlPlatinumHeartGold 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