This is one of my favorite teams to use, yet I do not really know how to make moves and would like help in working out flaws. I will walk you through how I decided on this team (scroll over Pokémon to see there specifics.)

I decided to build this team when I was swept by a Cloyster, so I started by putting a Cloyster on the team.



Next, I wanted a Physical and Special sweeper to center the team around, so I chose Chandelure and Terrakion. I was considering Alakazam, but I decided against it, because his frail defenses bugged me. I might swap out Chandelure for Thundurus-T, because it completely outclasses Chandelure. For the physical sweeper I chose Terrakion because of its natural bulk and superb attack and speed.





Next, I realized I needed a spinner and to set up some stuff of my own, so I chose Donphan. Vaporeon was another good support Pokémon for Wish support and to sort of stall and phaze my opponents stats.






For the final slot I added a Gorebyss so that I could pump up Chandelure. I can also pass to Terrakion if I see in team preview that they do not resist Close Combat.






No change you say, well I say nay. I changed Cloyster to hold Focus Sash, since it will outspeed almost anything after one Shell Smash, and it was annoying if it just got one-hitted right away. I also switched to Adamant nature, because it hits harder now.






Vaporeon was not really pulling its weight, so I switched it out for Dragonite because it could get a Sub/Shell Smash passed to it, and pown. I really liked this set.






I added Espeon in, and wasn't really thinking on who to switch out, so I switched out Terrakion. This thing can wreck after a Shell Smash with Stored Power, it can not be Roared out (a problem I was having and the main reason I added this) , and it can pass Calm Mind onto other Pokémon.






I put Terrakion back in. Dragonite was not really working out. I really have not tried it as is, but currently the team is in the 1400s on PS and after posting this, I will continue testing it.
More in depth view:

Gorebyss @ White Herb
Trait: Swift Swim
EVs: 252 HP / 32 SDef / 224 Spd
Calm Nature
- Shell Smash
- Substitute
- Baton Pass
- Surf

Chandelure @ Leftovers
Trait: Flash Fire
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Substitute
- Fire Blast
- Shadow Ball
- Hidden Power [Fighting]

Cloyster @ Focus Sash
Trait: Skill Link
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature
- Shell Smash
- Razor Shell
- Icicle Spear
- Rock Blast

Espeon @ Leftovers
Trait: Magic Bounce
EVs: 252 HP / 4 SAtk / 252 Spd
Timid Nature
- Calm Mind
- Stored Power
- Baton Pass
- Hidden Power [Fighting]

Terrakion @ Choice Scarf
Trait: Justified
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature
- Close Combat
- Sacred Sword
- X-Scissor
- Stone Edge

Donphan @ Leftovers
Trait: Sturdy
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Rapid Spin
- Toxic
- Earthquake
- Stealth Rock
I really enjoy using this team, but any help would be helpful. If anyone could help, it would be much appreciated.