The friendship app or frenship checker is given to you by a girl on the first floor of the Eterna city Pokemon center.
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You can find the app in the Pokemon Center in Eterna City. Talk to one of the girls.
yes two big hearts
In Eterna City's Pokemon center. Talk to a woman in there and she will give you the poketch app- freindship checker.
In Pokemon Diamond the Friendship Checker (also called the Happiness Checker) app is #6.
its a poketch app.