Smoochum... basically for laughs, because her name is LILITH and she's got 666 CP. I hope that gets an "okay, that made my day" out of people when they see Smoochum in a gym and then notice the CP and the name. It disappointed me later to realise that LILITH being all caps isn't visible to other players because all Pokemon names in gyms are all caps, but I decided not to re-rename her.
I'm also often showing off my Girafarig and Miltalk. The other two teams are dominating my neighborhood so it doesn't really matter what Pokemon I put in gyms, even my best ones don't last there very long. I'm more likely to defend gyms with quirky Pokemon I'm never using in battles. I don't take it very seriously unless my team already had the gym when I got there, which is something I'm not used to seeing every week.