Below is a complete lineup including stats for the Pre-National Dex and Post-National Dex which as you can see now include new Pokemon in the Sinnoh Dex

Pre-National Dex

Champion #1 - Aaron
Yanmega Lv.49, Scizor Lv.49, Vespiquen Lv.50, Heracross Lv.51, Drapion Lv.53

Champion #2 - Bertha
Whiscash Lv.50, Gliscor Lv.53, Golem Lv.52, Rhyperior Lv.52, Hippowdon Lv.55

Champion #3 - Flint
Houndoom Lv.52, Flareon Lv.55, Rapidash Lv.53, Infernape Lv.55, Magmortar Lv.57

Champion #4 - Lucian
Mr.Mime Lv.53, Espeon Lv.55, Bronzong Lv.54, Alakazam Lv.56, Gallade Lv.59

Champion #5 - Cynthia
Spiritomb Lv.58, Roserade Lv.58, Togekiss Lv.60, Lucario Lv.60, Milotic Lv.58, Garchomp Lv.62


Post-National Dex

Champion #1 - Aaron
Yanmega Lv.65, Scizor Lv.65, Vespiquen Lv.66, Heracross Lv.67, Drapion Lv.69

Champion #2 - Bertha
Whiscash Lv.66, Gliscor Lv.69, Golem Lv.68, Rhyperior Lv.71, Hippowdon Lv.68

Champion #3 - Flint
Houndoom Lv.68, Flareon Lv.71, Rapidash Lv.69, Infernape Lv.71, Magmortar Lv.73

Champion #4 - Lucian
Mr.Mime Lv.69, Espeon Lv.71, Bronzong Lv.70, Alakazam Lv.72, Gallade Lv.75

Champion #5 - Cynthia
Spiritomb Lv.74, Roserade Lv.74, Togekiss Lv.76, Lucario Lv.76, Milotic Lv.74, Garchomp Lv.78