PKMN.NET :: Dex :: Poke Radar
DEX -
ITEMS: Poke Radar

In-game description: A tool that can search out Pokémon that are hiding in grass. Its battery is recharged as you walk.
Price: 0

Technical explanation and other notes
Designates which patches of grass contain Pokemon, taken from a seperate list of Pokemon. Successive use increases the chance of encountering a shiny Pokemon.