He doesn't give it back, but the Professor is happy.
well than the gym leader comes and gives you the badge i thik
Pryce gives it to you after you beat him.
when you catch them it gives you an option
The man in the top of sprout tower
you get it after defeating team rocket in goldenrod lance gives it to you
he gives you $6400!
professor oak gives it to you
you talk to professor birch and he gives you a jirachi
Proffesor Elm Gives you it once you beat the first 8 gyms
The head of the radio tower gives it to you...
a man in pewter city gives it to you
it is on your pokegear when guide gent gives it to u