We already have that, CEB. It's called Yu-Gi-Oh.
Blade, joking aside, I assume you already know the reason why your statement is laughable and posted it for the sheer irony. (I suppose it is rather unfortunate that "dimension" is now easily equated with another plane of existence in a theoretical multiverse, but that's probably more exciting to people nowadays than the dimensional travels offered by L'Engle's classic A Wrinkle in Time.)
I have to agree with you on Giratina... the fifth gen could have been all about alternate dimensions and such (although I suppose it still could be the theme, meh), thus granting GameFreak the opportunity to retcon Arceus' "Godlike" image, making it the creator of this plane of reality but not necessarily all existence. Hell, they could do the creators of the other dimensions for the next five generations and no one would know the difference.
...Well, except those of us here who like to analyze and theorize about all things Pokemon in frightening detail. Oh well. Someone's gotta do it.