Marking map
you get the marking map in the poketch company place.
you talk to the person by the counter(he's the manager)and you keep on speaking to him until you have it.
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You can find it on any route. Just use the poketch app marking map!
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
You can access Fullmoon Island when you have beaten the Elite Four and obtained the National Pokedex. When you have taken the boat trip from Canalave, on Fullmoon there will be a legendary female Pokemon, Cresselia. Cresselia is extremely rare, however, when you interact with Cresselia, she will flee into the grass patches of Sinnoh, just like Mesprit. She will leave behind a Lunar Wing, which can be used to cure the boy who was having bad dreams. After that, if you have the Poketch app Marking Map, Cresselia should be easy to find. Hope this helps!
Go and talk to the owner of poketch in poketch company's building he will install the marking map app in your poketch
there are 25 apps for the poketch.