go to the beirry masters house and talk to the little girl.
if you have the berry searcher app you can do this but to get the berry searcher you need to talk to everyone in Salaceon town one of the people will give you it if you say 'yes' once you have it check for berries one of them must be a razz berry GOOD LUCK!
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
A resident in Solaceon town will give it to you.
The Pokemon Diamond and Pearl series can be watched on the official Pokemon TV website or by watching them using the Pokemon TV app for iOS and Android. You can also download the Diamond and Pearl episodes legally through the Pokemon TV app, but only up to 3 episodes at a time.
A woman in the Eterna City Pokemon Centre gives it to you.
from a woman in eterna city's Pokemon city
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 have to get an app called the berry finder ( i cant remember where to get it so just look that up on the internet). Then when you have got it go to it on your poketech and there will be a map. In some places there will be a small berry sign. If you got to where it is on the map and walk around a bit you should find them. Or the other option is to plant the berrries that make Pokemon friendlier yourself. Hope this helped.
You get app 11 at the vielstone department store ( i dont remember which floor sorry.)
Number 123987456
The dowsing machine is a poketech app which scans the ground for hidden items. It is app no.7.
If you have the happiness App. for your pokewatch thing... you can see how much your Pokemon loves you (how happy they are).