Would this be mixed Eelektross? (TBolt, Flamethrower, Giga Drain, Superpower or something along those lines) If so then I'd say Darmanitan or Victini. Eelektross can deal very well with both Water and Rock types that would stand in the way of Fire attack spam. Eelektross can pretty freely switch into a Rhyperior and OHKO it with a Giga Drain and can also switch into a bulky Water type and KO it with a Tbolt.