it depends on the place you use it on
the Pokemon you would normally find but with pokeradar you can get the shiny version of that Pokemon but that takes hours and there are some special rules for to get it. also pokeapp 20 is something you can use with using the pokeradar
the Pokemon that dawns little sister tells you
Try using the pokeradar, its not perfect but it could lead you to a find.
You can get Duskull by using the Pokeradar on Route 224 in Pokemon Diamond. You must use the Pokeradar at night in order to find and catch Duskull.
You can find it at Lake Verity or Lake Valor by using the Pokeradar.
smeargle
Trapinch is found on route 228 (desert) by using the PokeRadar.
You can find Kirlia on Route 203 and 204 by using your Pokeradar.
there is no cheat On the R4 you can choose a cheat to find shinys using the pokeradar
Check your PokeDex. All Pokemon which areas are glowing red need the pokeradar to find them.
A pokeradar is a device used in Pokemon to find legendary Pokemon. In the grass there are the Pokemon from the normal pokedex. but, if you were to use the pokeradar you will find legendaries. For example lets just say you are going through route 209 and you see wild grass while standing in it use the pokeradar and you could find a matang. that was an example. you do not find matang in route 209
To get a pokeradar in Pokemon diamond and pearl, you must see all of the sinnoh Pokemon in the game, then go to profeser rowan's lab and talk to him. he will give you a pokeradar and with it you can find Pokemon from other regions.