Actually with Kyurem, I was experimenting with it a bit. You can only use the DNA splicers to combine either zekrom or reshiram with kyurem. And let's say you have white kyurem, as I have. If you wanted the black kyurem, you still have the option to reverse the white kyurem to what it was originally by using the DNA splicers again (as kyurem and reshiram) and combine zekrom with kyurem. But you CAN't have them both which is the sad part but oh well, one is already so awesome
Gummayberz~ FC: 2595-0819-5240; IGN: Iceprinces; Rock Safari: Corsola, Nosepass, and Barbaracle; Breeder