For Blastoise, you can just throw in Mewtwo for a counter attack. DCE + Muscle band will take care of Blastoise with four energy. It will also do a lot of damage to Delphox when it is forced to attack. For me, the real question is how will other decks adapt to Pyroar? Blastoise and Emboar variants have answers (Blastoise and Delphox respectively). There's also Garbodor for big basic decks (though Goodra could be a problem). Genesect has G-Booster, but that's just one card that will be prized one time out of ten. Plasma will struggle the worst. They'll either have to throw in something like Flareon (heat tackle + two Deoxys) or rely on lasers to widdle away Pyroar's HP. Pyroar is not going to be unstoppable, but it should be enough of a threat to make people think.