Let's talk about PokeMMO.

FAQ:
>What is PokeMMO
It's a Pokemon Online Game. The game started 2012 in Private Beta.

>Is there a video of this game?
https://www.youtube.com/watch?v=G0ujQ0HB5Ng [Embed]

>What regions are available?
Kanto and Hoenn

>What pokemon are available?
All from the first 3 generations.

>Does this game use the Physical/Special split introduced in Gen IV?
Yes.

>How do I let my Pokemon follow me?
Just drag them out of your party.

>This game will get shut down by Nintendo.
No, it won't. The game itself doesn't have any copyrighted material, everything comes from the roms.

>I want to play this game so bad, where can I download it?
www.pokemmo.eu
You also need the roms FireRed (U), Emerald (U) and HG or SS (language doesn't matter)