You can find it right next to the TV station in jubilfe city.
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Go to Jubilife City and go into the poketch company towards the top left of the town. Talk to the professor. Keep talking to him until he gives you the marking poketch app.
You can find it on any route. Just use the poketch app marking map!
It's on your Poketch.
its a poketch app.
the poke radar isn't an app it is a key item, i think you get from prof rowan after completing the national dex