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Vega is flawed but fun. The gyms are much tougher than normal due to the mons having excellent movesets, there's a new region that's pretty nice, and there's a good mix of fakemon and real mons. I know people like to shit on fakemon since so many of them are shit, but Vega's fakemon are better than most games and are generally pretty good. There's also a large postgame from what I hear, with expansions to several existing areas.
The downsides are that many of the fakemon aren't available until you get to the postgame, and the game expects you to do a lot of grinding - the second gym has mon levels more typical of a third gym, for example. If you don't mind the grind, I recommend it.
If you do mind heavy grinding, try Brown instead like that other guy mentioned. Since you're playing w/ a friend having to trade to complete the pokedex won't sting as much.
