Syntaxlies

Changing it to 512kb in PokeSav fixed it for me, it opens fine in PokeGen. PokeBlack.sav

I've never heard of the Supercard, but I've used both an Acekard and a CycloDS. Both work fine. My personal recommendation would be an Acekard 2i, as it's extremely easy to set up and much more user friendly, and is very inexpensive. The only drawback is that there are a couple (probably less than 10) of problem games that will lag on it, however I haven't noticed any lag on B/W yet. Be sure to invest in a high quality micro SD card and not the ones that come bundled with the acekard itself. But be aware that if you plan to use the game on a flashcart, you won't be able to use infared features. This is the only limitation, everything else works fine, including the global link.

Yeah I have no idea. Even with the translated one I get the "The Skin data for C-Gear has been erased" message upon loading my save.

Didn't work for me. Additionally, PokeSkin ED gives me some weird error with a Yes/No option upon saving the imported skin, but I can't read it. Tried with the Pikachu/Piplup .psks posted in this thread.