Hmm, I'd like to mention up front that I'm not sure why we'd would want CAP4 to be SR weak. I know BMB said that he wanted CAP4 to be suspectable to passive damage, but SR weak I feel is too much. Either it's one of those typical pokes that have etchy reliant-on-spinners kind of strategies, or are just that awfully scary, that it can still be able to handle itself once in with 75% or even 50% health remaining. Dragonite/Volcarano.
For any risk taken, there should be an equal amount of perceivable reward you can get from taking the risk. I feel SR is one of those weaknesses that will either make us go wild in stat stages, or where we'll end up with speed+(sp.)attack boosting stat-up moves just to compensate.
I'm not proposing SR resistant, but neutral seems a bit less overkill, especially when we also want this thing to have some common weaknesses.
Not sure who proposed this first again, but when I saw the mention of Bug/Ground, I immediately liked the idea.
Weaknesses to Water, Flying, Fire and Ice are no minor weaknesses, but having Fighting, Ground and Electric as resistances/immunities gives plenty of reliable switching in space. If we make the switching in the risky gamble of CAP4, then there's only so much room we have left in different stages where we aren't just trying to overcome the weaknesses of the typing.