PokéBase - Pokémon Q&A
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1 Answer

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Yes, you can receive any Pokemon before the National Dex. of course, it can only be done by means of trading.

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It won't show up on your dex until you get the national update though.
Yes, nice add-on, Seabass!
Rydon isn't even in the Black/White pokedex to begin with.
As you can see if you just look, this was 8 months ago for HG and SS.