Mega Scizor can just discard Parallel City and just put down their own. Lightning Cloud is 100% right about Volcanion and Rainbow Energy, You don't take prizes and just get your energy removed. And Fire energy is just slightly better(but still very bad) because Scizor doesn't remove it with an attack(though, if you don't have Carbink on your field, Crushing Hammer does the same thing), and it is Max Elixir-able. But it doesn't have the infusion of Fairy in it, so Xerneas can't use it. To be honest, there isn't anything you can do to beat Scizor that doesn't completely destroy how the deck plays, so you either take the autoloss, or destroy the deck beyond playable for tournaments. Neither of those options satisfied me, so I just dropped the deck altogether. Delinquent is the closest thing to a solution there might be, but you still have to have 7 different types on your bench, and they can just Parallel City you, and if you play Parallel to counter them, then you get locked down if they play it first, and you can't bench the Pokemon you might need by not playing Sky Field. A split seems like a solution, but all it does is make to where you can't use either of the stadiums in the situation they are needed, and when you constantly have to discard Pokemon, you don't hit hard enough to OHKO, so you lose that way too.