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The Poke Radar is something that was only available in Gen IV (DPPt), and it’s used to seek out Pokemon hiding in tall grass. It’s also used to “chain” Pokemon in order to increase the chances of finding a shiny Pokemon.
You get it after you’ve been upgraded to the national dex (for seeing every Pokemon in the Sinnoh Dex) from Oak, and then Rowan will give you the Poke Radar.
Poke Radar- Bulbapedia will explain more.
The Poké Radar (Japanese: ポケモントレーサー Pokémon Tracer, ポケトレ Poké Trace for short) is a key item in Generation IV that is used to seek out wild Pokémon hiding in tall grass.
That’s what it is :P
That’s how to obtain it.
There is also a version of this in HG/SS called the Pokewalker
Source:Bulbapedia