Funnily enough I actually run that Ursaring set, except that I have swords dance over protect, oddly, as a recommendation on my rate my team - and let me tell you, it works great! Quick feet is, in my opinion, one of the deadliest leads in the whole of NU. The opponent almost always set up rocks first turn, so it's a free turn to raise your attack stat and then toxic orb kicks in and doubles speed. It is literally a fast, powerful sweeper capable of holding its own in even UU, and sometimes OU that ended up in the tier of NU. Use it.
PLEASE
Changes for Ursaring:
Protect --> Swords dance.
Please use my Ursaring lead, sweep, let him faint then bring in a stealth rock setter and proceed as normal... obviously starting with...
I'll be straight with you, the current Torterra set is OK at best. Seed bomb doesn't pack enough punch, substitute is lliterally a wasted attack and earthquakem while obviously a great move, leaves Torterra completely open to flying types. And in NU, there are som many flying types. Funnily enough, or maybe just that torterra's choices are limited, but my new set is the same as ium's... Listed in order of importance... Top one you pretty much MUST, his current move is useless, and the third one is sort of optional.
List of changes for Torterra:
Substitute --> Synthesis
Seed bomb --> Wood hammer
Earthquake --> Stone edge
Mr. mime is good.. baton pass? No. Just no. I see what you were trying to do, but a whole slot that literally checks one type is a move-slot wasted, especially when you have a set-up move that you could easily use well with substitute. It's very good with Mr. mime and nasty plot since mime has good speed and decent attack, pretty much ensuring a boost and probably taking down 2 pokemon after with your perfect near coverage!
Also your description for Mr. mime is weird. You put (and sometimes sub) in brackets there for something you can baton pass even though he doesn't know substitute, and you also said: "So when Mr. Mime isn't putting up walls to phase his opponents," yet he doesn't know how to set up walls!
Changes for Mr. mime:
Baton pass --> Substitute
While I'm no expert on muk, I do know that poison is horrible for offensive STAB (only Super-effective on grass) and while brick break is good... it's just too weak! Special walls in NU are rather rare, but I can't make use of this thing's move-pool offensive wise! His moves are very bad, but a pretty good set I could make would have to be:
Curse
Shadow sneak
Substitute
Ice punch
Basically you want to set up substitute, and then use curse as many times as you can! The speed stat being lowered is remedied completely by shadow sneak, which always goes first, and it just raises it's defense and attack to dangerous levels. Ice punch is there for coverage, you know, flying, hitting normals hard since shadow sneak can't, and, most importantly, the rock and ground types! This get's rid of a large weakness of Muk's, behind a substitute it WILL survive and with the curse boosting it's attack it should definitely OHKO - unless it has the ever so common sturdy in which you have shadow sneak. On paper this actually looks very good, and I might even try it on my team!
Changes for muk... well..
Shadow sneak, substitute, ice punch and curse as the set. They don't really go with the other set since the other set is bad. Very bad.

Glaceon is good. I wandered about signal beam though, however there seems no other decent moves. HP ground is a weird on an ice type though, I can onyl guess it's for fire types, but surely rock is better? I suppose ground is good on steel as well, however, tell me the last offensive steel type in NU you saw! Ground is SE on electric, steel, rock, poison and fire. Rock is SE on fire, flying, ice and bug. The second type's SE damage's typed pokemon are far more common in NU - or generally minus poison which is generally bad - so that is why ground is better.
Changes for Glaceon:
Hidden power rock --> Hidden power ground
Kanghaskan I have no experience in, and is honestly just another average normal type stuck in NU. Simple. Other people will have suggestions for him hopefully. I'm just going to say this now. Too much normal. Fake out and life orb is never a good idea. Drain punch and life orb is contradictory. Sucker punch is fine. Body slam should certainly be double edge. And yeah... A complete mess I think. Maybe Critical absol over kangaskhan:
...

@ Lansat berry
Trait: Super luck
Focus energy
Night slash
Psycho cut
Shadow claw / Slash
:) Hope you enjoyed this rate!!! :)