If you mean to obtain a poketch, it's very simple: First, you go to Jubilife and you'll be stopped by a man. He'll send you on a scavenger hunt for three clowns. The clowns are located by of the Poketch Building, behind the Pokemon Center and one's in front of the TV Building.
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It's on your Poketch.
its a poketch app.
Go to Jubilife City and go to the Poketch company after you have done the hearthome gym and talk to the guy in the purple jacket.
no you cant you have to find it on the ground (its looks like a normal pokeball) (or its invisible and u have to use the poketch app to find 1 but ive never known any1 who has done it)
You can find it right next to the TV station in jubilfe city.