I've heard about those Boomburst Taillows, but I still got an interesting one early that had Mirror Move. I think another find I had was a Spinda with Water Pulse, which kinda surprised me because I never even knew they could learn it but then again those things have a tendency to learn all these confusion-based moves. I think I also once found a Contrary Spinda, sadly I didn't catch it but it was cool though.
But Huge Power is the good ability on Marill... but I did find a few with Sap Sipper once. The most interesting part definitely has to be the moves, like Mud Bomb on the Skitty or the tutorial Poochyena with the elemental fangs.
dexnav is aweeesome. That's a pretty good Marill despite the ability! Most of my finds haven't been too good and I can't remember the few good ones I did get, but I really want to dexnav chain for a shiny male Ralts. </3