Right now, I only know about one or two. From them, one is my cousin. Unfortunately, she is out in California, so we never get to play Pokémon with each other side-by-side. Online, however, we find ourselves battling against each other every now and again, as well as trade. Currently, though, my router doesn't seem to be connecting to any Nintendo devices, which is preventing me from doing anything; last time we had traded or battled together would be about two months ago.
As for second, she is a friend of mine. I've known her since my first year of college. Similarly to above, sadly, although she and I are in New York, she's still rather far from where I am, so we don't get much of chance to play together in real life. Via Internet, it's not much of an issue.
More of my friends used to be into Pokémon games (around four or so), but they've all stopped following eventually. I've tried getting them back into the series, but none of my attempts seemed to have actually worked. It would have been great if it were more easy!