Hi :),
I've found a Megaman 2 Hacker, well, here it is:
http://www.megaupload.com/?d=IU4HPQRJ
You need to download a Megaman 2 ROM too, and a NES emulator, of course, so that you can execute your hacked ROMs
With yhis program, you can edit maps, and do what ever you want with the enemies
I hope you enjoy it, if you have any problem, just tell me ;D