A couple of years back, Protodude reported that Rockman EXE made a cameo of sorts in this obscure Japanese manga game called Zettai Zetsumei Dangerous Jiisan DS - Dangerous Sensation. Today I decided to look into it and see if I could figure out where Rockman shows up.
Starting off with some simple screen hacks, I made a cheat that allows you to skip to a level select screen. It's probably the debug menu but I can't be too sure. Use this AR cheat and hold select while transitioning screens. I think you need to make a save file first.
That should take you to the map select screen. To unlock the story-viewing modes, use this cheat and press Select, then change the map.