Devon Scope appears in 7 version groups since Generation III, a Gameplay item in the Key Items pocket
PokéAPI item 542 of 2,223, Gameplay category, Key Items pocket
Effect, in PokéAPI's words
Devon Scope: “Allows spotting of invisible Kecleon.”
Reveals invisble Kecleon on the overworld.
Games
Devon Scope is listed in the text of 7 version groups, first in Generation III
Game index by generation
IIIIIIIVVVIVIIVIIIIX
Named in
Ruby and SapphireEmeraldFireRed and LeafGreenSun and MoonUltra Sun and Ultra MoonLet's Go Pikachu and Let's Go EeveeSword and Shield