>>50138891PokéTransfer Lab though (It is post-game but for a ribbon quest you can just rematch the E4 for the Champion Ribbon). I assume Anon would be doing something like:
Colosseum (MT Battle Ribbon)>Emerald>Platinum>HGSS>BW/BW2 (No new Ribbons IIRC so basically just used to bridge Gen IV and VI)>XY>ORAS>USUM(I don't think SM has any exclusive ribbon)>SwSh>BDSP (Once it has support).
Im no Ribbon Autist however so that might not be the actual path, i also thi FRLG has no new ribbons from RSE, so E is the default for Frontier Ribbons, but Pt and HGSS does have some Ribbons exclusive to each IIRC.