I, for one, don't think Gliscor rising to S rank is as far-fetched as some seem to think. There are very few Pokémon which are able to just beat teams as consistently as Gliscor while still retaining this much defensive utility. In many ways, it reminds me of Mew at its prime, or Clefable right now. The thing is, neither of these ever have been S rank, simply because they have pretty well-defined counters and aren't too difficult to take advantage of. And while Gliscor is, generally speaking, harder to take advantage of than these two, it still has the problems you would expect in a defensive Pokemon. A lot of the time, it's forced into situations where it has to predict how the opponent will react. For intance, you send it in against Ferrothorn. Will the opponent switch out to Keldeo? Will he switch out to HP Ice Landorus-I? Or will he stay in and Leech Seed? And yes, Knock Off is really spammable, but coming from an unstabbed uninvested base 95 Attack, you're still not preventing a bunch of Pokemon from forcing you out, and a few megas (YZard, Slowbro, Gyarados, Altaria especially pre-mega) don't really care either way (though I guess Facade hurts a bit if Gliscor carries it but that's imo a lesser option than Knock Off in most cases, mainly because you lose great utility). At times, Gliscor can be a bit of a momentum-killer.
That being said, that's really the only problem I have with Gliscor. Its ability to completely terrorise slower bulky teams as well counter some of the biggest threats in the metagame, making it very easy to slap on a large number of teams, defenitely makes it at least a candidate for S rank, so please don't dismiss this nomination.
That being said, that's really the only problem I have with Gliscor. Its ability to completely terrorise slower bulky teams as well counter some of the biggest threats in the metagame, making it very easy to slap on a large number of teams, defenitely makes it at least a candidate for S rank, so please don't dismiss this nomination.