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Which romhack/fangame has the best post-game content? I remember being amazed by the Battle Frontier when I first played Ruby those many years ago, but I've never found anything that has come close to that feeling.
I guess you could say that something like PokeMMO offers an expansive post-game in that you can go on to PvP forever. And I'm not adverse to PvP, but I really enjoy PvE stuff more.