I know I am being very ambitious with this one because double weather teams are usually pushing it, but I think it can be pulled off. From playing with my team you just need to identify what weather typing does the most work against the opponent's team and what does the worst and then put in work.
Politoed @ Leftovers
Ability: Drizzle
EVs: 248 HP / 96 Def / 4 SpA / 152 SpD / 8 Spe
Calm Nature
IVs: 0 Atk
- Ice Beam
- Scald
- Perish Song
- Whirlpool
So the first weather setter, I went for a bulky set with perish song and whirlpool to deal with stall. Scald to burn things and stab water move. Ice beam for nice coverage on grass types that want to switch in also potential freeze. I was 50/50 about perish trap Politoed but it has been working out. Im not completely sold on it though.
Tyranitar @ Smooth Rock
Ability: Sand Stream
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stealth Rock
- Pursuit
- Stone Edge
- Earthquake
My second weather setter, its bulky with max attack and Smooth Rock because sand tends to be the most effective when sweeping through teams late game. Stealth Rocks because it's the most important thing to have on a team. Pursuit to trap psychics. Stone Edge for those pesky flying types. Earthquake because its too powerful. Can hold his own against and serves his purpose well.
Charizard-Mega-Y @ Charizardite Y
Ability: Blaze
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Fire Blast
- Solar Beam
- Air Slash
- Roost
My last weather setter, Wallbreaker Charizard. Fire Blast cause it 2HKO's pretty much anything, Solarbeam for water types that switch in on Fire Blast, Air Slash for flinch and stab flying type, roost to stay alive. While he is my weather setter he also ends up sweeping in some situations.
Kingdra @ Life Orb
Ability: Swift Swim
EVs: 252 Atk / 4 SpA / 252 Spe
Lonely Nature
- Draco Meteor
- Bounce
- Outrage
- Waterfall
My rain sweeper, Max Attack with 252 speed investment. Draco for special damage and raw power. Bounce for grass types that wall Kingdra, Outrage to destroy lives, Waterfall for water stab and flinch. He is a very effective late game sweeper against the right teams and is great for breaking walls for my other sweepers.
Excadrill @ Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Iron Head
- Rock Slide
- Rapid Spin
My sand sweeper max attack sand rush, Earthquake to end lives, Iron Head for stab and against fairies, Rock Slide for pesky flying types that switch in on Earthquake and Rapid Spin because its the second most important thing to have on your team. He is easily my most effective sweeper as Sand Rush Excadrill is very strong and outspeeds everything.
Venusaur @ Black Sludge
Ability: Chlorophyll
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Giga Drain
- Sludge Bomb
- Synthesis
- Hidden Power [Fire]
My sun sweeper max special attack to do the most damage. Giga Drain for stab grass and recovery. Sludge Bomb for stab against fairies and grass types, synthesis for great recovery, HP Fire for steel types that think they are funny. The least effective of my sweepers, I feel like he could be replaced by something to help my other weather sweepers as Mega Charizard does pretty much anything Venusaur can.
Importable:
Politoed @ Leftovers
Ability: Drizzle
EVs: 248 HP / 96 Def / 4 SpA / 152 SpD / 8 Spe
Calm Nature
IVs: 0 Atk
- Ice Beam
- Scald
- Perish Song
- Whirlpool
Tyranitar @ Smooth Rock
Ability: Sand Stream
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stealth Rock
- Pursuit
- Stone Edge
- Earthquake
Charizard-Mega-Y @ Charizardite Y
Ability: Blaze
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Fire Blast
- Solar Beam
- Air Slash
- Roost
Kingdra @ Life Orb
Ability: Swift Swim
EVs: 252 Atk / 4 SpA / 252 Spe
Lonely Nature
- Draco Meteor
- Bounce
- Outrage
- Waterfall
Excadrill @ Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Iron Head
- Rock Slide
- Rapid Spin
Venusaur @ Black Sludge
Ability: Chlorophyll
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Giga Drain
- Sludge Bomb
- Synthesis
- Hidden Power [Fire]
Politoed @ Leftovers
Ability: Drizzle
EVs: 248 HP / 96 Def / 4 SpA / 152 SpD / 8 Spe
Calm Nature
IVs: 0 Atk
- Ice Beam
- Scald
- Perish Song
- Whirlpool
So the first weather setter, I went for a bulky set with perish song and whirlpool to deal with stall. Scald to burn things and stab water move. Ice beam for nice coverage on grass types that want to switch in also potential freeze. I was 50/50 about perish trap Politoed but it has been working out. Im not completely sold on it though.
Tyranitar @ Smooth Rock
Ability: Sand Stream
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stealth Rock
- Pursuit
- Stone Edge
- Earthquake
My second weather setter, its bulky with max attack and Smooth Rock because sand tends to be the most effective when sweeping through teams late game. Stealth Rocks because it's the most important thing to have on a team. Pursuit to trap psychics. Stone Edge for those pesky flying types. Earthquake because its too powerful. Can hold his own against and serves his purpose well.
Charizard-Mega-Y @ Charizardite Y
Ability: Blaze
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Fire Blast
- Solar Beam
- Air Slash
- Roost
My last weather setter, Wallbreaker Charizard. Fire Blast cause it 2HKO's pretty much anything, Solarbeam for water types that switch in on Fire Blast, Air Slash for flinch and stab flying type, roost to stay alive. While he is my weather setter he also ends up sweeping in some situations.
Kingdra @ Life Orb
Ability: Swift Swim
EVs: 252 Atk / 4 SpA / 252 Spe
Lonely Nature
- Draco Meteor
- Bounce
- Outrage
- Waterfall
My rain sweeper, Max Attack with 252 speed investment. Draco for special damage and raw power. Bounce for grass types that wall Kingdra, Outrage to destroy lives, Waterfall for water stab and flinch. He is a very effective late game sweeper against the right teams and is great for breaking walls for my other sweepers.
Excadrill @ Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Iron Head
- Rock Slide
- Rapid Spin
My sand sweeper max attack sand rush, Earthquake to end lives, Iron Head for stab and against fairies, Rock Slide for pesky flying types that switch in on Earthquake and Rapid Spin because its the second most important thing to have on your team. He is easily my most effective sweeper as Sand Rush Excadrill is very strong and outspeeds everything.
Venusaur @ Black Sludge
Ability: Chlorophyll
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Giga Drain
- Sludge Bomb
- Synthesis
- Hidden Power [Fire]
My sun sweeper max special attack to do the most damage. Giga Drain for stab grass and recovery. Sludge Bomb for stab against fairies and grass types, synthesis for great recovery, HP Fire for steel types that think they are funny. The least effective of my sweepers, I feel like he could be replaced by something to help my other weather sweepers as Mega Charizard does pretty much anything Venusaur can.
Importable:
Politoed @ Leftovers
Ability: Drizzle
EVs: 248 HP / 96 Def / 4 SpA / 152 SpD / 8 Spe
Calm Nature
IVs: 0 Atk
- Ice Beam
- Scald
- Perish Song
- Whirlpool
Tyranitar @ Smooth Rock
Ability: Sand Stream
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stealth Rock
- Pursuit
- Stone Edge
- Earthquake
Charizard-Mega-Y @ Charizardite Y
Ability: Blaze
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Fire Blast
- Solar Beam
- Air Slash
- Roost
Kingdra @ Life Orb
Ability: Swift Swim
EVs: 252 Atk / 4 SpA / 252 Spe
Lonely Nature
- Draco Meteor
- Bounce
- Outrage
- Waterfall
Excadrill @ Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Iron Head
- Rock Slide
- Rapid Spin
Venusaur @ Black Sludge
Ability: Chlorophyll
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Giga Drain
- Sludge Bomb
- Synthesis
- Hidden Power [Fire]