Not really. The only Grass type that OHKOs you is Genesect, which is indeed a huge pain. Against Leafeon and Virizion you just spam Super Scoop Ups. Against Genesect you just kinda hope you hit heads on Crushing Hammer.
Eh. I feel like there's no situation in that deck that I would want to use another attacker. Quaking Punch's effect is just too broken. Especially combined with the stupids Trainers in the deck. I'd just play a different deck if I wanted to counter the meta.
I ended up going 6-2 at Fort Wayne. The time had run out in my fourth round match. I would have won that one because my opponent couldn't do anything to hurt me. They didn't stall, the battle just took that long. My other loss also went to time, but I was going to lose anyway. My final placement was 19 out of 244. New CP: 104