It's in exactly the same place as Diamond and Pearl, if you've ever played them. If you haven't here you go.
Go into Hearthome city and go straight ahead and to the left slightly and you'll see a normal house with a sign by it. Read the sign and if it says 'Poffin House' you're good to go.
Go to the right until you come to another slightly more appealing house and it should have a sign next to it. It should say 'Pokemon Fan Club' on it.
If you're looking for a poffin case, talk to the elderly man in there sitting on the blue sofa/couch.
Hope this helps (:
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In the Pokemon Fan Club, in Hearthome City.
The Trainers Fan Club is in Saffron City
first go to hearthome city and go to the Pokemon fan club talk to the chairman and he will give you a poffin case =p
beat the elite four and fly to lilycove city and go to the Pokemon fan club and you become a fan of the three children.
If you mean the Pokemon fan club in Vermillion City, then the answer is yes, it is free.