I might say Crobat.
He has the new buffed infiltrator to play with, meaning he can pick off weakened set up sweepers in lower tiers like submind chandy, he also packs a nice resistance to fairy, increasing his already decent/good defensive typing, and finally, last but most certainly not least, he holds the fastest non priority (fuck talonflame) of fastest pspinner (pseudo spinner, I'm hoping to get a ball rolling here.) thanks to the new defog, which not only greatly increases his support capabilities, but also allows dedicated voltturn teams to remove hazards without completely killing off their momentum, although at the cost of your own hazards, it could still be appreciated.
tl;dr, Crobat is gooood.