Will it be like this or will it be reversed, like you get the the Reshiram C-gear for black or you get the Zekrom C-gear for white? (I really want that Zekrom C-gear!!!)
It will be just like that. You will get the legendary opposite of the one you got in game. Same for skins.
if you have black you will get zekrom with white you will get reshiram. It's the opposite. same with the event. in black yoou get zekrom and in white reshiram.