in sandgem cityin front of the rowans lab which is on Pokemon hospital's left
Chat with our AI personalities
You have to see (NOT CATCH) every pokemon in sinnoh. Then go to professor Rowans lab he'll say wow i can't belive you seen every pokemon etc.. then professor oak will come and give you the app. (i still need arceus)
after you've completed sinnoh dex+Pokemon league,you talk to dawn who should beoutside professor rowans house.you might have to talk to her more than once.it is not called chaining app,its called poke radar,hope it helps!!!! ^_^
his lab is in Sandgem down. (on the left side.) just a short distance away from twinleaf town to the north-east)
in the house diagonally down left from rowans research lab she is in hearthrone city. and after you get the natioal pokedex she gives u eevee
Sandgem Town