They are different generations of the game, the storylines are different as well as the characters, there are different pokemon almost completely. Platinum goes with diamond and pearl. White goes with black.
Yes creselia is is in Pokemon Platinum.
vulpix is not in Pokemon platinum version.
you can get Pokemon that are not in the other version
Yes. There are only subtle difference's, the biggest being the Pokemon that are available in each version.
No
No, you can't tell the difference between shiny type Pokemon and non shiny types. You just have to rely on hope, or a trainer who didn't use the Action Replay on there version of the game. I was browsing it and i saw a shiny shamen!
no, these Pokemon are unknown in Pokemon platinum
The ID For Pokemon Platinum(USA) CPUE d074d1b3
you can't
yes but it is called Pokemon platinum
no you can not.
You can't, Mewtwo is not available in Platinum.