Adam - Leftovers - Contrary
Superpower / Night Slash / Psycho Cut / Protect
144 HP / 252+ Atk / 0- SpAtk / 112 Spe
The hammer. Contrary Superpower is great. With Tailwind up he's a Beater and a no-brains required smash-stick. He can walk through teams with proper support. If you play wrong early, though, this poke makes it literally as if you're playing 5 against 6. Most games, if I lead with MalCro, Malamar is going to Protect while Crobat Tailwinds, then just bash away while Cro suicides to get a second beatstick in beside Malamar.
Yewfell - Focus Sash - Inner Focus
Tailwind / Brave Bird / [Heat Wave][U-Turn] / Cross Poison
252 Attack / 0- Def / 4 SpDef / 252+ Spe
Inner Focus stops any Fake-Out attempts to prevent Tail Wind from coming up. I go back and forth on Heat Wave and U-Turn, but I think U-Turn is probably overall the better option. Cross Poison hits the fairies that can give Malamar problems really hard, and Brave Bird is a great stab option for suiciding Crobat out.
Balmung - Sitrus Berry - Intimidate
Fake Out - Close Combat - Wide Guard - Feint
124 HP / 252+ Atk / 0- SpAtk / 132 Spe
Charizard's best partner, by miles. He shuts down Rock types that could give Charizard big problems otherwise, and Fake Out support allows Charizard to fight M-Kanga. Feint breaks through the all-powerful Protect, which about 80% of mons in doubles carry. Wide Guard allows Charizard to beat pokemon who could otherwise one-shot him with Rock Slide. Close Combat is an obvious stab choice.
Ragnell - Charizardite Y - Solar Power
Protect / Fire Blast / Heat Wave / Solarbeam
0- Atk / 252 SpAtk / 4 SpDef / 252+ Spe
The God of doubles. If your team doesn't incorporate Charizard Y and/or carry something specifically to stop Charizard Y, you're gonna lose a lot of games. CharY defines the Doubles metagame like no other pokemon defines any other metagame.
Alondite - Assault Vest - Rough Skin
Stone Edge / Iron Head / Dragon Claw / Earthquake
252 Atk / 0- Def / 4 SpDef / 252+ Spe
My Charizard counter. He's not gonna get one-shot by pretty much anything, even strong Fairies etc. Big Ice hits can obviously still take him out and physical dragon attacks, but assault vest hides so much special tankiness people are always shocked at how little they do to him.
Arclight - Chesto Berry - Levitate
Will-O-Wisp / Rest / Hydro Pump / Volt Switch
252 HP / 0- Atk / 4 SpAtk / 252+ SpDef
Standard Rotom-W who does great against everything and everything. I really don't know how to explain what rotom does and why he's good because it's so naturally engrained in everyday play at this point. Turning off physical attackers while also tanking special hits like a king makes him a godlike tank and pivot. Resting off any residual damage is also a game-winner in the late stages when everything is low all around.