No, not yet
Only through the 3DS downloadable game Dream Radar.
you can find it in limewire or other illegal downloadable program but you can easy dowload from limewire just tap Pokemon Black Chaos and that it but look if it's not a viruse
Not yet.
no
You can't - yet
Yes.
It has not yet been announced when Keldeo will be available for download in Pokemon Black Version and Pokemon White Version.
the date is unknown and yet to be classified
You cannot catch Genesect on Pokemon Black or White. You will need to go to a Pokemon Event. No Genesect events are announced yet.
Yes.
no sorry