I like the idea of doing a flying mono and thought of doing one in rejuvenation, but decided to finally finish a regular run in reborn first. I thinl I'll keep an eye on this topic.
A little suggestion about the flying bugs: I don't know how good they are in reborn (atm just 3 badges, so I do not really know what the game throws at you, especially in an intense run), but in rejuvenation vivillion is just amazing. Compound Eyes and sleep powder, later on quiver dance and strong hitting attacks (especially something like hurricane, which gets 91% accuracy instead of 70) can deal massive damage. This bug will be frail, but a vivillion with precise sleep powders, some time to freely set up, can hit pretty hard and sweep some teams.
As said above, I don't know how good vivillion is in reborn, but I simply loved this bug in rejuvenation. Butterfree should work similarly, but misses some strong moves like hurricane (but doesn't need a beart scale to learn sleep powder). Of course, don't use vivillion if you are fine with other flying types (flying really offers a great variety) but I love how some fan games force me to test different pokes, especially in mono runs.