I'm still testing out your team, so I'm putting what all I have to say in a comment for now:
* Over than half of your team is weak to Grass Type moves (4/6, to be exact). This can make it hard for me to switch in to someone, even if I still have Chandelure and Bisharp still alive.
In general, this team has some weaknesses that can affect me trying to switch in on a Pokemon.
* Chandelure: I'd recommend a Choice Scarf instead of Choice Specs because Chandelure only has a base speed of 80. I'd still keep the Modest nature though. I'm a little worried about Trick because I haven't seen a lot of defensive Pokemon to Trick a Choice item onto.
*Keldeo: I'd recommend Timid over Modest nature because you'll be raising your Special Attack with Calm Mind.
*Cloyster: This is probably the Pokemon I have the most success with. I prefer Jolly over Adamant though.
*Mamoswine: I might say Stone Edge over Rock Slide, but if you don't want to deal with accuracy problems, then you can keep it. Also, Jolly > Adamant
*Lycanroc-Dusk: Lycanroc is good. It's so good that it's currently under a suspect test. https://www.smogon.com/forums/threads/np-ss-uu-stage-7-hungry-like-the-wolf-lycanroc-dusk-test.3670407/
I'd do Jolly Nature, and I would replace Endeavor with Psychic Fangs.
*Bisharp: Jolly > Adamant
I'm probably going to answer this at some point, and depending on if Lycanroc-Dusk gets banned from UU, you might want to have a replacement for Lycanroc-Dusk just in case it gets banned from UU.