Pokemon is protected by law. If some one were to put a simulation on line I would not rely on accurate gameplay. Otherwise, you have to purchase the game and, if not already in possession of one, a DS.
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There is no legal way to play Pokemon Platinum online for free. You need to purchase or rent the game on Nintendo DS or borrow the game from someone you know who is willing to lend it to you.
I believe it is impossible without a download.
Where can you go to play Pokemon online?
Nooooooooooooooooooooooooooooooooooooooooo