I can assure you HeYsUp, Wynaut is in no way a gimmick. I was sceptical of it's useage initially, but because of that me and Legacy Raider built a team designed to completely abuse Wynaut to it's fullest, it was actually banned the next day, but early results from that team were very VERY promising. It could easily do the old Wobbuffet trick of switching into slower walls on their turn of set up, encore and then switch to a sweeper for a turn of "free set up." Even if the opponents Pokemon was faster, it is easy enough to encore an attacking move and then switch to the appropriate Pokemon on nicely placed resistances. Although Wynaut was not as powerful as Wobbufett, it could still carry out similar tactics at least in UU, and if by no means a gimmick. I cannot say how well Wynaut would perform in OU as I have never experienced it myself.
I have faced someone using a Hail team with those Lv1 Clefable, Cleffa and Clefairy. I came out on top "just." The trick is to identify that they are Level ones when they come out, as switching is impossible. You basically have to sacrifice one Pokemon to each of them, but just make sure it isn't more than one! I guess if you're opponent was clever enough they would decide which Pokemon to sacrifice for you, (the ones that threaten his Stallrein perhaps.) The problem with playing with one of those teams, I would assume, is that you really only have 2 / 3 Pokemon you have to play with properly, unless you can find a good time to bring in the angels on set up moves. That may work once, but eventually your opponent will cotton on and not allow them to come in, there is very little wiggle room and it will have to be played extremely well.
