How do you use the poke radar?

Answer 1

from: Rabid_Jigglypuff of serebiiforums.To get a poke'radar you need to see or catch (optional) every pokemon of sinnoh and get the national pokedex which may not be easy to accomplish. Then go to Professor Rowan in Sangem Town and talk to him. Hope it works.

Answer 2

go into grass, when your not on your bike

and go onto key items and use it

simple as that

Also, it's a good idea to use a repel. Otherwise a wild Pokemon might attack you before you can get to a shaking patch of grass.

Answer 3

To use the Poke Radar in Pokemon games, you need to activate it while standing in a patch of tall grass. The radar will show shaking patches of grass where wild Pokemon are hiding. To potentially encounter a rare Pokemon, walk into the shaking grass and battle the Pokemon that appears. The key is to chain encounters to increase your odds of finding rare Pokemon.