OK, where to start?
In April 1999, a man called Jason Ross started writing a pokemon parody called pokebattles. It evolved into a decent sized community with many, many being written in this format. I discovered it late 2000, and in early 2001 it became the first internet community I was really a part of (Unless you count yahoo chatrooms, which oh god I don't). I also wrote a couple of battles for my own version.
Anyway, for its tenth aniversary, there's been a bit of a revival of it. It's pretty funny, so I do suggest you check it out if you're interested in reading a pokemon parody. And that goes double if you used to read it :)
Relevent links
Pokebattles.com - A central hub, containing a couple of battles and a link to the current forum, as well as archived stuff.
Forum - The current forum
Red - The original pb site, which contains a new Red battle.
Sandy - Umm... The new battles I've been writing for about a month now...