I completed Normal, Fire and Water so far. I am currently working on Grass and plan on going done the line. What teams did you use and items? For my grass team I have:

Jumpluff - Sleep Powder, Bullet Seed, Acrobatics and Cotton Spore
Cherrim - Sunny Day, Petal Dance, Weather Ball, Safeguard
Venusaur - Sleep Powder, Energy Ball, Sludge Bomb, Light Screen
Leavanny - Bug Bite, Leaf Blade, Entrainment, Reflect

I got rocked by a Roserade that was somehow faster than my Jumpluff.