Travel Trunk appears in 4 version groups since Generation VI, an Unused item in the Key Items pocket
PokéAPI item 764 of 2,223, Unused category, Key Items pocket
Effect, in PokéAPI's words
Travel Trunk: “Unobtainable, but allows the player to change clothes anywhere.”
Games
Travel Trunk is listed in the text of 4 version groups, first in Generation VI
Game index by generation
IIIIIIIVVVIVIIVIIIIX
Named in
Sun and MoonUltra Sun and Ultra MoonLet's Go Pikachu and Let's Go EeveeSword and Shield