You cant
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Actually you can trade Shaymin and Giratina to Diamond/Pearl from Platinum but if you do - Shaymin will revert back to its Land Forme and Giratina will revert back to its Altered Forme.
giratina is in turn back cave . "sky warrior" is shaymin and you need the action replay .once you have him get the "Grairsidea Flower". use it in the day and he changes.(don't enter a cave)
to get giratina you need to go to the distortion world and catch it but when you go back to your world it will change it's form to altered form to keep it in it's original form you need to have giratina, beet the Pokemon league then go back to the distortion world and you will apper where you catched giratina,go down then you will see a pokeball go get it and it will give you the griseious orb now go back to your world again and give the griseious orb to giratina and it will change back to it's original form
you can't
Giratina will have 2 new forms and Shaymin will have a Sky Form. There are 5 new Pokemon coming out. Since it's just a remake it probably won"t