Pokemon is... watching the very first episode of the anime with my best friend at the time and enjoying it immensely.
Pokemon is spending hours upon hours of my life in the damnable ingame casinos trying to get enough coins to buy a Porygon, but such a feeling of worth when I finally get one. Not to mention the hours and hours of repeatedly picking up rare candies from that glitched spot in Cerulean City on the first gen of games...
Pokemon (the TCG) is a time when I went out for the day with my friend and learned how to play. Since which I have lost interest in the TCG, though it put me on the path to playing other TCGs (YuGiOh! in particular, of which I have made quite a few friends by playing it).
Pokemon is the game I can immerse myself in no matter what few friends I had as a kid and when my parents were fighting so I could get away from it all.
Pokemon was and is everything from my childhood, the good and bad memories. I cannot say I've made any friends because of it, but it's helped me build up my common interests with my friends, bringing me closer to them. To an extent, it still does. With the newest ones, I don't doubt that it'll bring me closer to the friends I have nowadays.
I've been playing the games since they were first released and I still play them today, over 12 and nearing 13 years later. Seems all too much from a simple series of games and toys...