At the time of this writing, it is next to impossible to download and preserve the many i-Mode, EZweb and Java exclusive Rockman games that released in Japan between 2002 and 2011. Capcom Japan have long abandoned support for those platforms, leaving dozens of these weird Rockman games lost to time.
There are, however, ongoing efforts to rescue and preserve various i-mode games (hit up that link for more info). And while nothing has come out from the Rockman front (yet), we are lucky enough to have recorded evidence that these games once existed. YouTubers from Japan has started to upload footage of several "dumb phone" Rockman games, some of which we haven't seen in motion before. It looks like he has all of them on his phone so we can be hopeful they'll be dumped eventually. In the meantime, this is the next best thing. Check out the videos in the link above or after the break!
As an added bonus, here's some older footage of other lost games: