OK so I wanted to make a team around Specs Rayquaza. It was supposed to just be a fun team at first, but then it really started working.
Basically, Specs Aerilate Rayquaza 2hkos virtually the entire tier, even mons with a lot of special defense like Chansey and Registeel.
Process
Obviously Rayquaza is needed
Imposter proofing is a must, I chose Slowbro due to its ability to check -ates even with Precipice Blades or V-Create
Imposter Chansey fits on every team, and is a nice way to stop an opponent's setup sweep
This team still needs a special wall, so I opted for Audino, which also functions as a Knock Off and status absorber
Shedinja is annoying
I only had 1 slot left so I needed something that imposterproofed itself. Kyogre does that and is pretty hard to stop once it gets going
The Team
Rayquaza-Mega @ Choice Specs
Ability: Aerilate
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Boomburst
- Extreme Speed
- Trick
- Secret Sword
Rayquaza is an incredibly strong wallbreaker that 2hkos basically every common Pokemon. With a base 180 special attack, Choice Specs, Aerilate, and Boomburst, its virtually impossible to switchin something. Extreme Speed is useful to revenge kill faster mons such as Gengar, Trick lets it cripple stall Pokemon, and Secret Sword is useful to hit many Pokemon that avoid the 2HKO, like Assault Vest Tyranitar and Registeel
Slowbro-Mega @ Safety Goggles
Ability: Soundproof
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
IVs: 0 Atk / 0 Spe
- Baton Pass
- Defog
- Will-O-Wisp
- Recover
With the Soundproof ability, Slowbro is immune to Boomburst and it's extremely high defense allows it to take Extreme Speeds and even Returns with ease. Baton Pass is a useful pivoting move that cannot be stopped without Taunt and Will-O-Wisp lets it cripple many physical attackers, allowing it to wall Pokemon such as Bolt Strike Kyurem
Chansey @ Choice Scarf
Ability: Imposter
EVs: 252 HP / 4 SpD / 252 Spe
Jolly Nature
- Whirlwind
- Milk Drink
- Parting Shot
- Fake Out
Pretty standard Imposter Chansey. I opted for Choice Scarf in order to outspeed the opponent since losing due to a speed tie is pretty annoying.
Audino-Mega @ Toxic Orb
Ability: Poison Heal
EVs: 248 HP / 8 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Parting Shot
- Knock Off
- Spiky Shield
- Recover
Audino functions as one of the best Gengar counters in the tier. Knock Off allows it to remove Gengar's Spooky Plate, and is also useful against basically anything else. Spiky Shield is useful for blocking the opponent's status moves before Toxic Orb can activate.
Gengar-Mega @ Spooky Plate
Ability: Mold Breaker
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Pursuit
- Judgment
- Secret Sword
- Shell Smash
Boring standard Gengar
Kyogre @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 108 Def / 148 Spe
Timid Nature
IVs: 0 Atk
- Quiver Dance
- King's Shield
- Scald
- Ice Beam
With its solid defensive typing in Water and good defensive stats (100/90/140), Kyogre functions as a great bulky sweeper that is also imposterproof. EVs are to make sure that Kyogre outspeeds base 140s (Mega Mewtwo Y) after a Quiver Dance and maximizing bulk. The moves are fairly standard, Ice Beam was picked over Moonblast to prevent losses to Imposter due to crits.
Concerns
Couple of replays
http://replay.pokemonshowdown.com/balancedhackmons-388920101
http://replay.pokemonshowdown.com/balancedhackmons-386264843
http://replay.pokemonshowdown.com/balancedhackmons-385823053
http://replay.pokemonshowdown.com/balancedhackmons-386260003
http://replay.pokemonshowdown.com/balancedhackmons-385818679
http://replay.pokemonshowdown.com/balancedhackmons-383535193
Basically, Specs Aerilate Rayquaza 2hkos virtually the entire tier, even mons with a lot of special defense like Chansey and Registeel.
Process
Obviously Rayquaza is needed

Imposter proofing is a must, I chose Slowbro due to its ability to check -ates even with Precipice Blades or V-Create


Imposter Chansey fits on every team, and is a nice way to stop an opponent's setup sweep



This team still needs a special wall, so I opted for Audino, which also functions as a Knock Off and status absorber




Shedinja is annoying





I only had 1 slot left so I needed something that imposterproofed itself. Kyogre does that and is pretty hard to stop once it gets going






The Team

Rayquaza-Mega @ Choice Specs
Ability: Aerilate
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Boomburst
- Extreme Speed
- Trick
- Secret Sword
Rayquaza is an incredibly strong wallbreaker that 2hkos basically every common Pokemon. With a base 180 special attack, Choice Specs, Aerilate, and Boomburst, its virtually impossible to switchin something. Extreme Speed is useful to revenge kill faster mons such as Gengar, Trick lets it cripple stall Pokemon, and Secret Sword is useful to hit many Pokemon that avoid the 2HKO, like Assault Vest Tyranitar and Registeel

Slowbro-Mega @ Safety Goggles
Ability: Soundproof
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
IVs: 0 Atk / 0 Spe
- Baton Pass
- Defog
- Will-O-Wisp
- Recover
With the Soundproof ability, Slowbro is immune to Boomburst and it's extremely high defense allows it to take Extreme Speeds and even Returns with ease. Baton Pass is a useful pivoting move that cannot be stopped without Taunt and Will-O-Wisp lets it cripple many physical attackers, allowing it to wall Pokemon such as Bolt Strike Kyurem

Chansey @ Choice Scarf
Ability: Imposter
EVs: 252 HP / 4 SpD / 252 Spe
Jolly Nature
- Whirlwind
- Milk Drink
- Parting Shot
- Fake Out
Pretty standard Imposter Chansey. I opted for Choice Scarf in order to outspeed the opponent since losing due to a speed tie is pretty annoying.

Audino-Mega @ Toxic Orb
Ability: Poison Heal
EVs: 248 HP / 8 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Parting Shot
- Knock Off
- Spiky Shield
- Recover
Audino functions as one of the best Gengar counters in the tier. Knock Off allows it to remove Gengar's Spooky Plate, and is also useful against basically anything else. Spiky Shield is useful for blocking the opponent's status moves before Toxic Orb can activate.

Gengar-Mega @ Spooky Plate
Ability: Mold Breaker
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Pursuit
- Judgment
- Secret Sword
- Shell Smash
Boring standard Gengar

Kyogre @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 108 Def / 148 Spe
Timid Nature
IVs: 0 Atk
- Quiver Dance
- King's Shield
- Scald
- Ice Beam
With its solid defensive typing in Water and good defensive stats (100/90/140), Kyogre functions as a great bulky sweeper that is also imposterproof. EVs are to make sure that Kyogre outspeeds base 140s (Mega Mewtwo Y) after a Quiver Dance and maximizing bulk. The moves are fairly standard, Ice Beam was picked over Moonblast to prevent losses to Imposter due to crits.
Concerns
- Hazards might be nice to get some free damage on opposing mons and possibly turn Boomburst 2hkos into OHKOs.
- Team has a huge weakness to physical PH Shift Gear users (Slaking, Regigigas, Tyranitar)
- No phasing on the team - Chansey is the only counter to setup sweepers.
Rayquaza-Mega @ Choice Specs
Ability: Aerilate
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Boomburst
- Extreme Speed
- Trick
- Secret Sword
Slowbro-Mega @ Safety Goggles
Ability: Soundproof
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
IVs: 0 Atk / 0 Spe
- Baton Pass
- Defog
- Will-O-Wisp
- Recover
Chansey @ Choice Scarf
Ability: Imposter
EVs: 252 HP / 4 SpD / 252 Spe
Jolly Nature
- Whirlwind
- Milk Drink
- Parting Shot
- Fake Out
Audino-Mega @ Toxic Orb
Ability: Poison Heal
EVs: 248 HP / 8 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Parting Shot
- Knock Off
- Spiky Shield
- Recover
Gengar-Mega @ Spooky Plate
Ability: Mold Breaker
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Pursuit
- Judgment
- Secret Sword
- Shell Smash
Kyogre @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 108 Def / 148 Spe
Timid Nature
IVs: 0 Atk
- Quiver Dance
- King's Shield
- Scald
- Ice Beam
Ability: Aerilate
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Boomburst
- Extreme Speed
- Trick
- Secret Sword
Slowbro-Mega @ Safety Goggles
Ability: Soundproof
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
IVs: 0 Atk / 0 Spe
- Baton Pass
- Defog
- Will-O-Wisp
- Recover
Chansey @ Choice Scarf
Ability: Imposter
EVs: 252 HP / 4 SpD / 252 Spe
Jolly Nature
- Whirlwind
- Milk Drink
- Parting Shot
- Fake Out
Audino-Mega @ Toxic Orb
Ability: Poison Heal
EVs: 248 HP / 8 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Parting Shot
- Knock Off
- Spiky Shield
- Recover
Gengar-Mega @ Spooky Plate
Ability: Mold Breaker
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Pursuit
- Judgment
- Secret Sword
- Shell Smash
Kyogre @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 108 Def / 148 Spe
Timid Nature
IVs: 0 Atk
- Quiver Dance
- King's Shield
- Scald
- Ice Beam
Couple of replays
http://replay.pokemonshowdown.com/balancedhackmons-388920101
http://replay.pokemonshowdown.com/balancedhackmons-386264843
http://replay.pokemonshowdown.com/balancedhackmons-385823053
http://replay.pokemonshowdown.com/balancedhackmons-386260003
http://replay.pokemonshowdown.com/balancedhackmons-385818679
http://replay.pokemonshowdown.com/balancedhackmons-383535193