I just Reached Lucian in the Elite 4 with this team;
Luxray-Lv.40-Tackle, Charge Beam, Spark, Crunch
Haunter-Lv.40-Sucker Punch, Shadow Punch, Shadow Ball, Confuse Ray
Infernape-Lv.44-Rock Climb, Close Combat, Flame Thrower, Mach Punch
Dialga-Lv.55-Shadow Claw, Ancient Power, Dragon Claw, Roar of Time
Lucario-Lv.41-Quick Attack, Force Palm, Dig, Aura Sphere
Manaphy-Lv.37-Surf, BubbleBeam, Waterfall, Super Sonic