Defeated Cheren today, he did put up a good fight though with a Stealth Rock/Dragon Tail combo.
I'm going to see more of Nimbasa City.
My team is:
Level 81, Male, Serious Nature
Waterfall, Megahorn, Ice Beam, Surf
Level 83, Female, Lonely Nature
Shadow Ball, Will-O-Wisp, Energy Ball, Flamethrower
Level 82, Female, Serious Nature
Return, Leech Seed, Megahorn, Horn Leech
Level 83, Female, Calm Nature
Psychic, Thunderbolt, Energy Ball, Attract
Level 80, Female, Docile Nature
Dragon Pulse, Flamethrower, Flash Cannon, Crunch
Level 79, Male, Quirky Nature
Acrobatics, Rock Slide, Earthquake, Fly
And there's a few other Pokemon in the PC that I train here and there.