You question is very vague. Do you mean the plot or the basic concept of playing a Pokemon game?
Yes creselia is is in Pokemon Platinum.
vulpix is not in Pokemon platinum version.
No
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.
There is not a verstion of platinum for gba
No
no.