Here's my thoughts of the elite 4 with my sinnoh post battle zone team
Staraptor LV 90 Attacks: Brave Bird, Roost, Aerial Ace, Drill Peck (chain-bred with Steelix)
Enperuito/Empolion LV 76 Attacks

rill Peck, Hydro Pump, Aqua Jet, Defog (sucks)
Palkia LV 69 Attacks:Flamethrower, Draco Meteor, Spacial Rend, Surf
Lucario LV 81 Attacks: Nasty Plot (chain bred with chimchar) Aura Sphere, Water Pulse, Dark Pulse
Crobat LV 72 Attacks: Aerial Ace, Air Slash, Extremespeed, Agility
Luxray LV 85 Attacks: Discharge, Thunder, Thunderbolt, Extremespeed
Aaron: Killed w/palkia
Bertha:Killed w/ Lucario
Flint: Killed w/Palkia
Lucian: Killed w/Lucario
Cynthia: Easy, Roserade killed w/palkia, Garchomp killed w/palkia, Milotic owned w/Luxray, Gastrodon destroyed (taught Palkia energy ball), Lucario was hard but he was defeated w/Palkia, Spiritomb killed w/Palkia
Basically a Breeze for me since I killed them on my first try and I only used a max revive on Empoleon (w/Flint's Infernape's Thunderpunch) all it took was a few rival battles and about 30 pokemon (and trainers) in victory road to raise my pokepals to such a fearsome level that even cynthia would beg for mercy at my feet.