Sorry I dropped the ball on this one. Lots of traveling for work and shit. Anyway, I'm not sure what I'd post except Moth quietly reacting to things. Maybe an offhand comment about how he's not entirely surprised and was always taught to never trust the government. Heh.
Also, Scatterbug! Larvesta might fit more because it turns into a fiery moth, but I think Scatterbug matches his personality. It's a bug type and kinda dorky and cute. The potential's there, but...it's got a terrible name. I mean, it's a bug type with "bug" in the name. Kinda low-effort. On the other hand, Vivillon was in my first main team against the Elite Four, and it can have over a dozen different wing patterns. Moth would love collecting them.