Please see the the "Finished Games/Demo" archive. My personal recommendation is Pokemon Liquid. It just wouldn't seem right to recommend my own game, Lunar. But hey, there are a heck of a lot of good games here. Make a random pick, it'll probably be great.
You're going to get yourself into trouble making lots of threads like this.. If you have queries then post in the rm2k(3) help and requests section which is stickied..
And please try to be more specific :)
Pokemon Indigo League is a re-creation of the original Pokemon TV series in game form
To play a hosted, game download it and run it on your computer (use the links provided in the stickied Archive thread). If you mean online games, sorry, there aren't any here. I'll leave this thread open in case you have any further questions.