Mewtwo. I can't put into words how bitter I was that I couldn't get it back when I had Pokémon Blue. It will be available as a special download from February 12th through the 26th for anyone with Pokémon Black or White. This isn't just charity; this promotion follows on the heels of Pokémon TCG: Black & White on February 8th.
In honor of this new Mewtwo release, the spiffy little guy has been given some upgrades like Shadow Ball and Electro Ball. Mewtwo also comes with Psystrike, and a few other goodies for trainers and their pokémon. For all the information on how to get your hands on Mewtwo, go here. It may not be the same as having him on Blue and Red, but I'll take it.