Does anyone know if there is some sort of master list somewhere of all of the unlockable battle challengers? I know I'm missing pretty much all of the ones from the Research Notes, but other than that I'm not so sure and I'd just like to be able to see which ones I could potentially unlock still.

here should be a complete list. If not, I can make one for you when I get home.

It looks pretty complete to me. Thank you so much!

No problem :)