There's really not much to do once you get all sixteen. I guess you could go back and do the elite challenges, but other than that, there's no greater challenge out there. Not unless the Elite Four decided to start taking challenges when nobody was looking.
Don't do much with the smiles, but happy birthday? Though I guess it'd be belated now.
And as for the Pokédex... it really depends. There's proof that Yamask used to be humans before and that some Shedinja snatch your souls when you look at their backs. Think it's safe to say that Kadabra's entry is a big joke, though. I've seen nothing that proves they used to be humans, and Abra's entry sure doesn't mention it.
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Don't do much with the smiles, but happy birthday? Though I guess it'd be belated now.
And as for the Pokédex... it really depends. There's proof that Yamask used to be humans before and that some Shedinja snatch your souls when you look at their backs. Think it's safe to say that Kadabra's entry is a big joke, though. I've seen nothing that proves they used to be humans, and Abra's entry sure doesn't mention it.