You just hold down a Pokemon on the app and some or no hearts would show up.
In Pokemon Diamond the Friendship Checker (also called the Happiness Checker) app is #6.
The friendship checker app in the Pokémon games shows you which of your Pokémon like you. To use it look for hearts next to a Pokémon when you have the screen up.
Just go to Eterna city, and go into the Pokemon centre. Talk to some lady (i think she has green hair), and she give you the friendship checker app on your Poketch.
The friendship app or frenship checker is given to you by a girl on the first floor of the Eterna city Pokemon center.
Go to the Pokemon Centre in Eterna City and speak to the brown haired girl, she will hand you the Pokétch app "Friendship Checker".
The friendship checker (my personal favorite app) is inside the Pokemon center of eterna city. Talk to the lady with brown hair right byt he tile pokeball in the floor.
from a woman in eterna city's Pokemon city
Get some mates.
You can find the app in the Pokemon Center in Eterna City. Talk to one of the girls.
In Eterna City's Pokemon center. Talk to a woman in there and she will give you the poketch app- freindship checker.
they dont like you.. you dont treat him good...
Budew evolves when it has the highest possible friendship (two hearts get bigger on the friendship checker poketch app) and gains a level.