when you get given the 5 poke balls catch a Pokemon, the deposit the starter Pokemon you chose and change box, while the box is changing you will need to save the game, when it comes up 'saving don't turn off the power' you turn it off. then go to start new game and pick a different starter Pokemon, go to the box and the one you deposited will be there :)
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there isn't a cheat but you can trade them over from other Pokemon crystal versions.
type this code 010075DA and now u can get all three starter Pokemon
you'll needcheats.
you cant in platinum but you could trade from Diamond and Pearl or another Platinum.
You can get another starter if you get all the sinnoh pokemon. Proffeser rowan will ofer a johto starter.