Well, I can say that I will never consider Flygon to be number one. It has no strategy, so it's all about damage buildup or stalling. Put out a Pokemon like Mime Jr from Supreme Victors, and you'll turn a heavy hitter Gon into a staller Gon. Problem solved with Dialga G.
And what's wrong with Gengar? Even in the format, it does well/decently. It has haters, yes, but that' because it's considered the "cheap deck" and some people refuse to accept that it works. At least it doesn't one hit k.o. basics.
Glisctomb scares the Moo Moo Milk out of me, but then again, it's countered by Nidoqueen and Unown G, some of the most commonly teched cards.
Dialga G is DEAD. Plain and simple.
LEGOs is non-existant where I play.
Palkia lock is also non-existant.
Luxpe is gone, because it barely had any strategy in the first place, and Spiritomb and Mr.Mime MT kill all SPs.
Blazeray never existed in the first place.
Salamence: Difficult to get going, but will do well.
Arceus:God Pony can't fight for his life.
Macheap:Going strong against the dying SPs, it will mainly be the BDiF for the juniors.
Gyrados:With the surprise gone, Gyrados is no longer a viable threat. It has too many weaknesses. Before, it was new, so it was harder to find them, but now they're easy to spot.
And for Kingdra, I can't really say, because no one in my area has played it in a while.