I honestly don't know if there is a thread for this yet, but Imma gonna make one!
Here is my team: Post Elite Four - -
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Ninjask: The Ninja LV100
As it is said in its name, Ninjask is mainly a Ninja [to me]. Its best stats are Attack and Speed, so put it with the Silk Scarf and Slash plus a Dire Hit and you are almost guarenteed to win. Plus put a slow Pokemon in before fainting and let Speed Boost do its work before Baton Pass. My moves:
Slash
Aerial Ace
X-Scissor
Baton Pass

Drifblim: The Typecaster LV100
It very much serves a purpose to Water Type Pokemon. Thunderbolt paired with Magnet is a good matchup as always, and if you get one maybe put Thunder on it too (IDK if it can learn it). Also a Flyer, And deals with Ghost and Psychic Types amazingly along with Fighting. My Moves:
Shadow Ball
Psychic
Thunderbolt
Fly

Swampert: The Powerhouse LV100
It may not seem it, but Swampert is beside Ninjask in attack value. Go to the battle subway, get 100 BP, spend them on Protein. Gets the job done pretty fast and nicely too. Freeze them with Ice Beam, go outside of Battle with Surf or use it on Rock/Ground/Fire. Pair those with Earthquake and Hammer Arm. Hammer Arm causes Speed to lower plus low speed already, so give it Quick claw for good measure. My moves:
Hammer Arm
Surf
Ice Beam
Earthquake

Shuckle: The Tank LV100
If only my little cutie-pie was a Female, we would counter everything. Thing is, I'm just glad its nature doesn't affect its Defense(s). It doesn't even need Sturdy, but Toxic+Attract equals amazingness. Rocky Helmet for the Steel Types. My moves:
Strength
Toxic
Attract
Stone Edge

Ninetales: The Witch-Doctor LV100
Ninetales is cute, spooky, and best with Status moves. It is quite simple to Burn them with Flamethrower and lower attack, the use Confuse Ray, Quick Attack for first attack or little damage and then use Safeguard to protect from status ailments yourself. Razor Claw for critical hit ratio skyrockets. My moves:
Flamethrower
Quick Attack
Confuse Ray
Safeguard

Whimsicott - The Breaker LV100
I have Infiltrator, so Light Screen/Reflect/Barrier/Safeguard/Protect/Detect are my friends and let me strike. Use Cotton Spore to lower Speed, well, you'll probably be first anyway, but then Psychic for lowering Special Defense, then hit hard with Gust and Hurricane. Plus, Hurricane can confuse them and Gust hits flyers. Then give it the Miracle Seed if I ever give it Giga Drain. My moves:
Cotton Spore
Gust
Psychic
Hurricane

That's it for now, perfect team analyzed!