No Guard
Weak Armor
Illusion
I actually don't inherently see moxie as a "risky" option, but mostly because that depends on it's stats. Meaning on fairly resilient pokemon like Scrafty it isn't as risky since it has a decent shot at getting a moxie boost, especially after a DD. Were you to give it to a revenge killer like Dugtrio though, then it would be more risky. Simple on the other hand is a bit more clearer on the risk/reward thing, but i think the abilities I voted for are better suited for this due to the fact that they all would lead to cap4 fitting into a certain niche, which is not a bad thing. (High powered moves that would miss if used by most other mons at the expense of being hit by everything (no guard), a bulky slow pokemon that progressively becomes faster and squishier (weak armor) or a pokemon that mimics another to try to scare it away and set up to sweep (illusion))