Team Help

[Filthy Casual]

So I've been playing through E17 for a bit, and after the Serra battle, it has become abundantly clear my team needs improvements. I've been using Pokemon I've never used before this whole time (except for the starter), but I want to add some more members soon. Below is my team, along with movesets (as natures can be changed down at 7th Street). 

Spoiler

Juggernaut (Chesnaught, Overgrow, male)

-Spiky Shield

-Seed Bomb

-Leech Seed

-Bite

 

Kelphyr (Dusclops, Pressure, male)

-Shadow Sneak

-Shadow Ball

-Curse

-Will-O-Wisp

 

Duchess (Nidoqueen, Sheer Force, female)

-Bite

-Toxic Spikes

-Sludge Wave

-Earth Power

 

Cold Cuts (Alolan Sandslash, Slush Rush, male)

-Icicle Crash

-Hail

-Swords Dance

-Iron Head

 

Rocarosa (Corsola, Natural Cure, female)

-Bubblebeam

-Rock Smash

Recover

-Power Gem

 

Krackatoa (Camerupt, Solid Rock, male)

-Lava Plume

-Earth Power

-Earthquake

-Rock Slide

 

The top four are definitely going on my final team. I picked up Corsola not too long ago, and have loved using her ever since. I would be sad to see her go, but if necessary, I will make the change. Camerupt, however, is absolutely the first on my personal chopping block. I know it's good, but I hate it when I repeat types, and I would rather have Nidoqueen as my ground type.

Any help is appreciated. Thanks!

[Youmu9]

I'd suggest a flying type since your team has a big ground weakness. Any flying type you like will do but i'd suggest Swellow or maybe Mega Pinsir if you want a mega. And if you like Corsola then you should keep it on your team. If used well it could be valuable even if it's on the weaker side.