Hello, welcome to PokeMMO!
There are currently no official plans for implementing gen 6.
PokeMMO currently houses four regions, Kanto, Hoenn, Sinnoh and Unova.
If you have any other questions don't hesitate to whisper me ingame @HumongousNoodle
Hope you enjoy the journey!
For doubles I would suggest a rain team and playing in Multi battle (co-op), this makes it a bit easier as you can focus on making it a 2v1 battle when necessary.