A resident in Solaceon town will give it to you.
Get the PokeMarker Poketch app from Jublife City Poketch building. It will show you where Mesprit is.
it's a poketch app for tracking wandering pokemon, that you get in jubilife
I am thinking you get it from the poketech company. correct me if i am wrong
It is hidden in the wall at the end of a path, on the center left of the big room. You can also use the dowsing machine (poketch App) to help you find hidden items.
talk to the man in celastic town with a happiny he is in the left side of town
You get the app from the president of the Poketch company in Jubilife City after winning the Veilstone City Gym battle. In Pearl, this app is used for tracking Mesprit and Cresselia
from a woman in eterna city's Pokemon city
you need to get a poketch that has an app for the time set to you ds
you touch the screen with your stiylist
Get 3 badges and obtain it in Jubilife City Poketch building.
Talk to the Poketch President after receiving 7 gym badges.
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 get the Happiness Checker Poketch App by talking to a woman in Eterna City's Pokemon Center. This app allows you to see how much your Pokemon likes you.
You can find it on any route. Just use the poketch app marking map!
Kinda. Just battle with him a lot, and check his happiness with your Poketch app that shows you the hearts.
http://www.pokezam.com/games/ds/diamondpearl/poketch3.jpg
the poke radar isn't an app it is a key item, i think you get from prof rowan after completing the national dex