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get the Poke tech App Poke happyness
talk to a girl in the eterna city Pokemon center on 1F
Find poke app 8(berry searcher) by a girl on route 208.
In the app store
u click and hold the Pokemon with ur stylus
It is included in the Pokétch when you first got it in Jubilife City.
If you mean the itemfinder, you get it from dawn or lukas on route 207.
from dawn ( choose right hand )
You can get it from Professor Oak, in Pal Park.
the poke radar isn't an app it is a key item, i think you get from prof rowan after completing the national dex
go to valor lakefront with all the houses and use rock climb down to a house go inside talk to the guy he gives you poketch app 15.PS. the app is coin toss
at the poke app store in jubilife city when you talk to the president on the right door.