5th Gen How do I have both Black and white Kyurem at the same time?

I have the DNA splicerS (see the emphasis on the s?). I have both black 1 and 2, traded over my original kyurem and reshiram hoping to be able to have both black and white kyurems in my party but it will only let me have one. That's a downer as having both was a big reason why I got the game (other than it being pokemon). So am I doing it wrong or is there some little exploit I can do to make it work.

You can only have one at a time.

It's a rule they made that you can't have BOTH black and white kyurem in the same game. Don't ask me why, I didn't make that rule. It's stated here: http://pokemon.marriland.com/black2_white2/walkthrough/black-white-kyurem/giant-chasm
Read the stuff in yellow box at the bottom of the page.

FFFFFFFFFFFFFFFFFFFFFFUUUUUUUUUUUUUUUUUUUUUUUUUU-

And what were the devs thinking?!?!?!?!?

The Splicers' effects (there are two pins according to the description) are Links to Kyurem to allow him to Absofuse with Zekrom OR Reshiram. Once you fuse, the pins' effect changes to separate the fusion.

Since in their world only 1 Kyurem, 1 Reshiram, and 1 Zekrom exists at a time, only two of them can fuse at once. This has been answered, next time use Q&A.