Cloyster could check it if its defensive and the mence that its facing is just ddance. If it has draco, check it with something else.Cloyster can smash on Mega Mence and DD / defensive Mega Altaria fairly easily, and can break Mence's subs, but it needs SR off the field to beat Mence reliably, considering Fire Blast deals about 75%. As for Latios, Draco Meteor OHKOes even at -2. Maybe it deserves to rise to C-.
Cloyster is a good sweeper, its just that i think it's one of those pokemon that gets a bad rep simply because it is used so poorly by inexperienced players. Often times I see them leading with it with focus sash, or smashing when its not the acceptable time to do so when your check is still around. Lets take a standard offensive team that consists of Keldeo, Weavile, Lando-t, DDance Mega altaria, magnezone, and Latios taken from the link here: http://www.smogon.com/forums/threads/altarias-metagame-smashers.3522162/. All credit goes to TerrorDave not me.
A Bad player brings it out turn one and smashes while magnezone volt switches and Weavile ice shards to take you out.
A good player would switch it in after Keldeo is gone and gets a chance against Lando-t and Ddance Mega altaria one on one. They can't do enough damage to you due to your 180 base defense, you smash with enough health to last the whole game and you win.
Not only that, Cloyster has other options other than smashing. It can be physically defensive to check a lot of key mons like dd mence, dd nite, gliscor, some fire types like talonflame and mega charizard x to an extent. It could set up hazards and rapid spin if it wanted to (it has better options though). It can even run a defensive overcoat set to screw over Breloom leads (thats niche though).
While cloyster may not be the first thing to think about basing a team around, due to its flaws, Its a lot better than people percieve it to be. I have yet to see a good player actually use cloyster seriously.
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