Believe it or not, there a Pokemon MMO, and it's very good. Completely free and tons of fun. The following simple steps below will allow you to jump in. Rumor has it, a player who goes by "stulew" is the Pokemaster.
Here is the site - http://pokemmo.eu/
On the right hand side is where you can register.
After that, on the top you will see downloads. From there you will see this picture below.
Here is where you can download Fire Red v1.0 (the game you will be playing)
If you still can't figure it out, here is a video explaining the process.
If you have any questions on this or want to talk games tweet me @BlanketsWilson