Glace, Some people have tried Yveltal/Raichu/Garb but it sucks because no space, and people have tried Landorus/Raichu/Garbodor but it loses to Yveltal (Raichu doesn't help all that much tbh, Yveltal is borked).
Yveltal/Garb is the most popular deck by a significant margin, and I'd probably say that's followed by Yveltal/Raichu and Virizion/Genesect. Everything else sees play but not as much as those three.
Glace, I took 3 AP's, it sucked and I had to stay up till 4 in the morning for weeks straight. I'm at Cornell doing the summer program here for the next six weeks.
Yveltal is pretty much the god of the format, with Garb and then some people are playing with Raichu which I don't really like. Aromatisse (nicknamed Faries) is ok, Blastoise and Rayboar are good but took serious hits when Druddigon came out, Virizion/Genesect is still really good, Plasma is alright, and Charizard is good but I suck at making lists for it.