For the longest time, I though PokeMMO was the best... But now I realize that this game may be. You get 3 regions, all pokemon from gens 1-6, really good remixed music, and you even get to keep the legendaries! My only complaint though, is that the game doesn't really look like pokemon in the overworld. AFter a while though, it begins to!
I don't know why Poke + MMO was replaced as spam. I like this mmo much better now that I think of it.