>>18714815Aggron might be incredibly vulnerable before mega evolving, but the defensive stats are calculated as after he mega evolves, so that's not much of a problem. The only thing that isn't calculated that turn is speed, which doesn't change even with Mega Evolution.
Special Sweepers, being common as all hell, are a serious problem. Other than the disgusting Chansey, and even that, I personally can't think of anything that can really take those kind of hits.
