I just got my Japanese Reshiram from trade, and I'm thinking of getting Kyurem too. BUT, if you recall one of the Pokémon Bank screenshots, there was a Trainer who would recognize Kyurem. I'm thinking that if you showed that trainer Kyurem, you would obtain the DNA Splitters for both Black Kyurem and White Kyruem forms. If this is true, let me know below. Thanks!