"Both with cheaters and greed"
I hope you are aware that by being on ProjectPokemon you are one of them, right?
Furthermore, every single online game out there has such people. Why? Because it's not the game, it's the personality of the person.
As for the PC emulator... Sure, make it, go. But if you think that hasn't been tried then you haven't searched. An emulator isn't something you can just magically make. The compiling and rendering of all data and graphics without extreme frame losses would require a high end computer if not done correctly.