It shows how effective a move is against a type of Pokemon.
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its a poketch app.
You can find the app in the Pokemon Center in Eterna City. Talk to one of the girls.
The friendship app or frenship checker is given to you by a girl on the first floor of the Eterna city Pokemon center.
It means thAt. That Pokemon is at maximum happiness and if youcan answer this , where can you find a happiny in any of the three Pokemon games ( platinum pearl or diamond )
In Eterna City's Pokemon center. Talk to a woman in there and she will give you the poketch app- freindship checker.