I'm pretty sure Darmanitan2 (life orb with flare blitz and superpower) would cause an almost guaranteed loss if it was the opponent's lead. Unless the calculations are different than my expectations, Darmanitan2 will be faster a ferrothorn, chansey, AND eelektross, and even worse than that, it can OHKO the Chansey and Ferrothorn lead. And a LO flare blitz should also be at least a 2HKO on Eeleketross, which means he can't switch it in on the expected flare blitz. Since I don't think the AI would use Swagger (which that moveset has) when it can OHKO the opponent's lead, the best play at that point is just to let his ferrothorn get killed, hope Eelektross doesn't get OHKO by LO flare blitz, and to revenge kill to force a really dangerous 2v2 situation. From there, something like a Mold Breaker Haxorus (EQ on Eelektross and hits Chansey really, really hard) could probably clean up without the opponent even needing a 3rd.