I really think that Escavalier should be stay in the S tier.
A lot has been said about it's great typing and decent defences, and then people have focused on it's middling speed stat, as though it doesn't work that well in this offensive metagame. However, Escavalier actually works wonders in this metagame, as it is so hard for offensive teams to switch into. Moltres is 1HKO'd by Return after Stealth Rock if it tries to switch in, while Nidoqueen is 1HKO'd by Iron Head. Anything else that's offensive, such as Kabutops, falls to the sheer power of Megahorn. Common revenge killers, like Sceptile and Rotom-C also fail to 1HKO Escavalier back and then get destroyed back. It's not like Escavalier can't come in on anything easily either. Cryogonal, Uxie, Amoonguss after sleep clause, Jynx, Fraxure and Sawsbuck are just a few of the things it can switch in on with ease. It has it's counters, but defensive teams in general are on decline and with that are it's counters like Poliwrath and Steelix.
Escavalier isn't just limited to offense though. Defensive RestTalk tank sets are very effective at shutting down many top sweepers, such as the aforementioned Lilligant and is one of the best switch-ins to Tangrowth in the metagame, and lots of others as well(that I forgot :P).
Overall, Escavalier is really strong, wrecks offensive teams, has good bulk and a great typing. It is sort of versatile as well, being able to go full-out offensive and rather defensive as well. Definitely S class material.
Another mon I feel is really under-rated is Crustle. Crustle just works so well as an anti-lead at the moment, being able to beat Smeargle, Uxie, Mesprit and Aerodactyl, 3 of the most common leads at the moment. He also is able to get up 2 layers of hazards and possibly a hit off versus Druddigon. Although he doesn't have access to Spore, he is able to beat Cryogonal trying to spin your hazards away, which is something that Smeargle can't do. I'm not sure if Weak Armour activates upon each hit of Rock Blast, but if it does then you can beat Kabutops as well. At full health, it can act as a makeshift check to lots of stuff like Lilligant and Substitute Sceptile that can quite easily stop Smeargle.
Although he doesn't have the versatility of Smeargle or Spore, he is a great hazard setter and anti-lead, and IMO should be A rank.
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