Why didn't GF give each of the Gym Leaders and E4 members a mega in a rematch? It would have been so easy to make.
Viola:M-Heracross
Grant: M-Tyranitar
Korrina: M-Lucario
Ramos: M-Venusaur
Clemont: M-Ampharos
Valerie: M-Mawile
Olympia: M-Medicham
Wulfric: M-Abomasnow
Siebold: M-Gyarados
Drasna: M-Garchomp
Malva: M- Houndoom
Wikstrom: M-Aggron