You mean action replay? Pokesav and pokegen are the programs for making pokemon and you can download them for free (and there is an online pokesav) Getting the .pkm files from your computer to the DS is the hard part. Pokesav used to have a way to download them directly to you DS, but it is not working now, so Action Replay or a flash cart is the only way.
I have an action replay, so if you ever need pokes, let me know.