Re: Question About Trading Old Pokémon to B/W
Some people beat me to it, but yes. Of course you can't catch the first 4 Gen Pokemon until after you complete the main story.
However, you can self trade an Egg from Japanese Black to your English White/Black via the Union Room. It's possible because the games can communicate with each other; the same way a Japanese Gen IV game can connect with an English Gen IV game.
And... you can't PokeShift eggs; I tried that. XD The eggs must be hatched before migrating~
Anyway, the egg you trade over will still be "tamago" in Japanese, but will hatch into an English Dratini. (the fun thing is, you'll get its Japanese dex entry, even as it evolves too!)
Hope this helps! n_n
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"A sword wields no strength unless the hand that holds it has courage.
" - Hero's Shade, Legend of Zelda: Twilight Princess