wait about an hour and tap "start search" walk around and shoot a grey cloud theres a 50% chance it will be a pokemon if its a pokemon jam the A button until the bars full/it cries.
P.S it could be a item
Chat with our AI personalities
if you mean the map marker you can catch mesprit Pokemon of emotions with it hope this helps
Route 216 with the Poke Radar
fuego ironwoks (use poke radar)
you first get tornadus and thunderus then you have to get a special amount of dream orbs to get the extension for landorus
you can catch dittos in Pokemon diamond and pearl with poke radar in route 218 but its pretty hard to catch them + find them. :)