>>56265531In terms of looks, it's hard to say. There's too many possible fusions, so I'm sure there's one out there that would be my actual favorite. These few though are some of my favorites though. Shame most of them suck.
In terms of viability? Absol + Shedinja. All those high crit chance moves hidden behind a mon who's only weak to fairy, status, and weather effects is fun.