im pretty sure u get it from one of the professors
Go and talk to the owner of poketch in poketch company's building he will install the marking map app in your poketch
You Catch it.
the poketch marking map can be obtained by the poketch president after getting the 5th or 7th badge
it's a poketch app for tracking wandering pokemon, that you get in jubilife
Get 3 badges and obtain it in Jubilife City Poketch building.
poketch stands for Pokemon watch
Talk to the poketch company president (Poketch building, 1st floor). He'll give the app and many other ones, too.
When a Pokemon is travelling around (mesprit, cresselia) the marking map will show a little face. Wherever the face is on the map, you will find the Pokemon. The Pokemon wil not be standing there, it will be hiding in the tall grass or even on water..
You can find it on any route. Just use the poketch app marking map!
throw a master ball or ues false swipe
talk to the president of the poketch company in jubilife city
You have to go to Jublife City, into the Poketech building. Talk to the man in front of the counter, and he will give you the marking map.