Dowsing Machine appears in 11 version groups since Generation I, a Gameplay item in the Key Items pocket
PokéAPI item 465 of 2,223, Gameplay category, Key Items pocket
Effect, in PokéAPI's words
Dowsing Machine: “Use to find hidden items on the field. AKA Itemfinder.”
Used by trainer outside of battle: Searches for hidden items.
Games
Dowsing Machine is listed in the text of 11 version groups, first in Generation I
Game index by generation
IIIIIIIVVVIVIIVIIIIX
Named in
Ruby and SapphireEmeraldFireRed and LeafGreenHeartGold 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