The only thing that comes to mind that beats both of these Pokemon reliably is ironically another Bisharp (with Low Kick to hit opposing Bisharp). You obviously have to be wary of switching into Sacred Sword, but Aegislash will be spamming Shadow Ball most of the time so it shouldn't be too much of an issue. Mandibuzz handles most sets of these Pokemon, but it loses to the best Aegislash set, Subtoxic. However, since the ladder is awful, SubToxic is really uncommon, so you should be fine with just Mandibuzz. Also, I forgot about Chesnaught, which also works.Is there pokemon that can reliable counter both Bisharp and Aegislash?