Aw man! I used to have the ROM to the Mega Drive version already patched back in 2009, but I don't know where it went. I know for sure that I burned it into one of my CD-R's to use on an emulator for the Dreamcast, but since I no longer have that, chances are I can't find that CD. Maybe I might look for it some time.
As for how I managed to get my hands on this ROM, when I posted a video about looking at the tiles within the SNES ROM in Tile Layer Pro, someone posted a comment that contained a link to the Mega Drive version (I forget his name, of course).
I remember that someone posted a code where you can fight the other Pokémon besides Dogars under control of of the computer.