I'm not sure about "can", but the "how" is either cheating or doing it the very patience-trying way.
There's the theory of "back-and-forth-generation trading". From Blue version (I'd assume you'd use Blue), trade to GSC (which is a pain right there...)
Not sure (and this would be the major hitch in the plan) if you can trade from GSC to RSE. I don't know, I haven't tried it (and probably won't for a long time...)...
That's the way I propose to do it. Wouldn't think of any other possible way other than hacks.
Hope this helps!
It's great to complete a Pokedex! So I'll need some help...
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