IRC? What does that stand for? http://www.pokemon-tcg.com is looking for some ideas for future Community such as a chat room. You can put in your thoughts in a survey in their community page. Hope that helps.
Internet Reley Chat, And mediadriven is now run off an ip instead of www.mediadriven.net, i'm not sure what it is...but try the pojo java chat, it should show it, then you can log in with the ip
Bulbagarden has a channel on mircx, #bulbagarden, though it's not usually all that well frequested. If the people here at PokéGym would like to use it, and help it to be more active and known, you're more than welcome to. We'd love to have you.
Whoever took over #pokegym on mediadriven, can you please PM me http://forums.afterdawn.com/thread_view.cfm/47221 This is a pretty good guide on getting started using mIRC.