You can't use them in an on-cartridge battle wifi battle, so they aren't included here. If you want to play with them, make an OM submission about it here:Why are shadow Pokémon not implemented? they were unique and a genuinely cool concept but you seemed to gloss over. them their stats were even known. they had unique moves, strengths, weaknesses, and difficulties.
http://bulbapedia.bulbagarden.net/wiki/Shadow_move
http://bulbapedia.bulbagarden.net/wiki/Shadow_Pokémon
http://www.smogon.com/forums/forums/om-submissions.398/