yes.
Go to where Giratina was in Diamond/pearl, that is Turnback cave
in turn back cave
you cant
Beat the Pokemon league again and go back to spear pillar and you will see dialga again.
you go back to the time tunnle
Yes I think so
No, since Misty chose to stay back in Kanto, she will not be in Pokemon Platinum.
yes, it is an ID. It is printed on the back of all Pokemon platinum DS, cartridges.
The turn back cave in Pokemon Platinum is in Seodoff Spring near veilstone city
in turn back cave
You can catch "it" in the Distorted World/Torn World, after a series of puzzles. If you dont get it there, you can always get it back at Turnback Cave
its impossible to do that, Pokemon cannot go back to their first form
unfortunately you can't.
you cant
no
Beat the Pokemon league again and go back to spear pillar and you will see dialga again.
if you mean from platinum to soul silver then yes you can trade the back and forth
yes the code is back of your Pokemon game.