[del]Garchomp LV.X[/del] *SHOT for bad joke*
I like Fearow for the search engine. You're running really just deltas, and this ensures you have something every turn for very little cost and space in the deck (a 2-2 line is MUCH easier to fit and make consistant then a 2-0-2/1-0-1/2-1-2 line, even if the 2-1-2 line is Meganium)
R-gon seems to be the way to go, now just find a way to either block Blissey for a while or be prepared to lose several games. It's also vital to ensure you have an early game wall, 'cause Krickets will overrun you if you don't bide your time sufficiently. That being said, Mr.Mime might not be the best idea, as Cessation Crystal is common, and Blissey cracks up looking at the pale faced mime.