I would disagree Zapdos serves pretty well as a check to Yanmega.
Non-Speed-Boost variants are revenged by standard LO Zapdos while Speed Boost Bug Buss can only do 38.3% - 44.9% to a standard LO zapdos even with choice specs. Of course, you could run HP Ice, but I haven't seen lots of Yanmegas doing that
Excellent point. HP Ground is neccesary to cover Registeel and Empoleon, so changing it wouldn't be neccesary. Though, it's quite a simple matter of carrying a Zapdos counter. Timid LO Nidoking is able to take anything Zapdos can throw at it and then 2HKO any set that's not a dedicated special wall. Jolly banded-Weavile can either OHKO or 2HKO all of its sets with ice punch, even a dedicated physical wall.