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.
In Pokemon Diamond the Friendship Checker (also called the Happiness Checker) app is #6.
You can get the friendship checker in HeartGold at Goldenrod City. Talk to the happiness rater and she will say a phrase that indicates your Pokémon's happiness. This determines your friendship levels.
Get some mates.
Fly/walk to Eterna City and go into the Pokemon center. Talk to the girl inside there and she will give you the friendship checker.
in golderod city is a frienship rater
220 or more, it should show 2 hearts on the friendship checker.
in goldenrod on the right side of the town
Go To Pastoria City,then go do the safari game. Catch six different kinds of Pokemon and the girl by the counter in the great marsh building will give you the friendship checker.
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 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.
The friendship app or frenship checker is given to you by a girl on the first floor of the Eterna city Pokemon center.
Install virus software