The current sendPKM scripts don't work with pokémon Black or White, if that's what you're asking.
I presume Nintendo changed the GTS code slightly; so the old method of sending pokémon no longer works. I, obviously, have no idea when (or if) sendPKM will be updated to be Black/White compatible, so wait about.
If you're playing on a flashcart, why not just use pokésav instead?