Partner Pokemon: Gardevoir
How Active I'll Be: TBH, I have no idea. When I get on PC, I get sidetracked by a bunch of other topics here, and honestly, the groups are the last place I check.
As for which Pokemon need a pre-evo, I think Volbeat and Illumise could definitely have a single pre-evo that evolves into one of them depending on its gender. I also think Absol could have a pre-evo and Spinda could have an evolution.