Zach gave you some awesome information already. There've been so many good Pokemon games since the third generation - you'll miss out, so be sure to try 'em. I'd personally recommend starting with Platinum, then moving onto HeartGold or SoulSilver, then Black or White, and finally Black 2 or White 2. B/W2 were unique since they weren't just an "updated" version of B/W but rather games with an entirely new story. If you're looking to get back into Pokemon you definitely can't miss those. :D;
But hey, welcome to PC! New and old Pokemon fans alike fit in perfectly here. We love all of you new members yeah!
I grew up playing Pokemon with all my friends too.. those were some really great memories. We always trades, mixed records, and battled. Multiplayer in Pokemon made the games really fun and there were so many of them to collect.. I never did complete my Pokedex, though. Your friends are going to have a great time since there's so many cool new things in the series now and the games are constantly becoming better. We even have the amazing X & Y coming out in October, hopefully you guys've read up on that. They look so amazing and we have a
whole board dedicated to talking about these games on PC.. check it out! n~n You can speculate on possible new features and discuss already-released information, such as the new Pokemon and the new type. It's become a pretty popular board, plus lots of members have been returning to discuss the games as well. I'm sure you'd meet lots of cool friends there. :)
If you have any questions about the games, ask away in their respective boards! So questions about the fourth generation games would be asked in the Fourth Generation Gaming board, for example. We have some pretty smart folk around here so they'll be helping you out as soon as they can. PC is full of Pokemon experts~
Hopefully this forum entices you enough to stick around, since we would definitely love to have you! See you around sir and great meeting ya.