ehh, i dont think that will be possible since i dont have platinum, i only own white thats why i was asking if black andwhite 2 were compatible
but i have a friend who goes to school with me and is in pokecommunity, he will get black and white 2 once it comes out and maybe just maybe he'll battle you and he currently has heart gold so maybe pm him, he is luxray 7856 and this is his profile:
http://www.pokecommunity.com/member.php?u=340353 so yeah talk to him if you want a battle in heart gold or black and white 2