Wow, my Makuhita hs to solo at least 2, maybe even 3 if you're unlucky, and then Mudkip has to solo between 3 and 5 G.L.M.P.
Just a note, because there's a possibility that all 8 gyms might now be taken, all the other challenges will have to not have any gym requirements, or it would be physically impossible to finish the game.
EDIT: Because Its a Random specified it cannot be Roxanne, there's only 7 gyms left. If you happen to have to solo 3 with Makuhita and 5 with Mudkip, you're stuck. Do tell us if you happen to be that unlucky.
Just A1 for short. Apparenlty people can't spell Treadshot.
Recent Scramble link
Note: Yes, it is spelt wrong. Deliberately. Shut up, you're not the first to notice.