There are programs that can make Gen V pokemon, but as far as I'm aware none can make 100% legal/legit-looking pokemon because they haven't figured out all the hidden hex, algorithm and trash byte stuff quite yet. Though they have figured out quite a bit of it. There is quite a bit more to making proper sav'd pokemon outside of the obvious ability, pid, iv type stuff.
If you want to generate gen V pokes then use PokeGen for now (though like I said I won't be surprised to find ones generated now show up illegal in the future after more knowledge is discovered). There is a version of PokeSav that works with B/W, but I don't believe it is translated all the way yet and might be buggy. I imagine the tools/knowledge will pick up in quality substantially in about a month after everyone gets their hands on the NA roms/carts.
http://projectpokemon.org/forums/for...php?88-PokeGen
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