@nyttyn While the concept of contrary is intriguing, its also far from an optimal partner with Weak Armour. First off, you would have to give CAP4 moves like hammer arm, superpower and/or other strong moves that normally lower your stats. If we are using offensive contrary, it implies lower offenses and thus devalues any non-setup variant of weak armor. Intimidate makes you stronger. People have to worry about defense boost hax with shadow ball. Contrary makes tail glow and swords dance lower your stats, so thats not a risk we need to worry about. The only thing you can do AGAINST contrary is swagger.
Magic Bounce is the furthest thing from risky and contradicts the purpose of Weak armor unless CAP4 has pathetic special defense, as weak armour implies physical bulk. At this point CAP4 becomes a physical espeon, who has psyshock anyways.
I would advocate Simple as long as CAP4 does not get any defense boosting moves or shell smash(Seriously, white herb=OP). Weak armour is the other ability, which implies relatively high Defense, then if defense is doubled, it only renders Special attacks and critical hits as viable options. This significantly lowers risk. However, a boosted swords dance or nasty plot could be just what CAP4 needs to sweep.
I'm sad no guard didn't make the cut, but I'd like to back up Sheer Force and introduce Shield Dust. Both of these remove secondary effects from attacking moves. These are more viable with each other than Weak Armour admittedly. However it decreases luck based victories, which was the goal with No Guard. Hopefully No guard advocates will back me up here?
I like the concept of Harvest too. It makes sense flavourwise, and I like the fact that it encourages Sun, because rain is way too broken. That said, I want to see Custap Berries and Pinch Berries used more. However, it may make Bug Bite Scizor become more common.
I also think Analytic and Illusion work perfectly with Weak Armour, as it allows for tanking with the former and mind games with the latter. Furthermore, unlike Zoroark, CAP4 may be able to take some hits thanks to its defense.
I would finally like to back Quick Feet and Marvel Scale. They work well with Weak Armour, and allow for potent Sweeping with the former ability and tanking with the latter.