Old Rod appears in 13 version groups since Generation I, a Gameplay item in the Key Items pocket
PokéAPI item 422 of 2,223, Gameplay category, Key Items pocket
Effect, in PokéAPI's words
Old Rod: “Used to catch Pokémon in bodies of water.”
Used to find Pokémon on the Old Rod list for an area, which are generally Magikarp or similar.
Games
Old Rod is listed in the text of 13 version groups, first in Generation I
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