I was about to start a similar thread. I agree with grant on Dedenne as a Yveltal counter. Much more splashable as a basic and it's especially good with silver bangle (3 energy = (60 + 30)2 for 180 or 2 energy = (40+30)2 for 140, putting it in range of a virbank/laser KO). Raichu is still good, but I for decks that need an easier solution, a Dedenne or 2 works while having uses outside of that matchup thanks to entrapment (call for family).
For the toad, Leafeon PLF is generally the best, but next set will give us Yanmega with a CCC attack that does 50 + 50 more if it was switched from the bench that turn. It has free retreat and a draw attack so perhaps this will be the next stage one tech that will pop up in decks (like Raichu and Beartic). There's also the supporter Xerosic. It can either get rid of a tool (disabling garbodor even under item lock) or special energy (getting rid of that DCE on Seismatoad).
For now, things like Yveltal XY and Thundurus EX, that do damage while getting back energy, do very well against decks that use Seismatoad. Seismatoad/Garbodor stops abilities and items, but doesn't do jack against attack effects. Even mere stasis effects could work in a pinch, giving you that one turn to use items again. There's also Scizor BC, which has safeguard in attack form (40 and can't be damaged by EXes for a turn).