Since Poinko is gone for the weekend, I will take this one... The National Dex is there, but it apparently only appears if you actually trade from FR/LG, not with something from RuSa, even if it is an unatainable. I dont know why, but that is the case. After he imported LG, I decided to get FR to get an even more complete Dex.
And yes you can trade with the Japanese and american RuSa carts, and also with the FR/LG carts. They are inter-compatable, trust me. It alters their names somewhat between the 2, but Natures, stats, Moves, ect stay the same... just get translated...