I don't agree with 0x, but perhaps a stadium capping the damage that these attacks can achieve at, say, 120? It still has a big effect on the low hp ex pokemon like Jirachi and puts you at 2 hit range for everything including the coming mega-aggron without letting it ohko big ex pokes in one turn, and fitting all the common multiples bar perhaps the occasional 50x? Not that i like these huge turn one hits for 100+ anyway since I like my stage two decks, but considering the Virigen/yveltal/etc meta, it might be just what it needs.
And yeah, these trainer/ability lock decks are a bit silly sometimes, perhaps we should get slightly weaker versions of popular items that aren't affected by things like seismitoad?