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...wait, what? You mean I could literally download a ROM of White and trade my Pokémon from Black with it? And collect White Forest exclusives, and do Entralink, and stuff?
Yikes.
Even so, Entralink is not a Wifi thing, and I don't know how the C-Gear stuff or Union Room stuff works on the ROM. Wifi is another story; if you can get it a connection somehow, you can trade just fine.
Probably best to use the actual wifi pack, then. Nevertheless, more experienced people can help you in Emulation within the B/W Emulation Help Thread, so ask there next time. Or in Quick Questions here if it's in-game specific! However, in case you're not sure where the Entralink is, it's in your C-Gear menu. n_n