Mantyke @ Life Orb
Ability: Swift Swim
Level: 5
EVs: 36 Def / 200 SpA / 36 SpD / 196 Spe
Modest Nature
IVs: 1 HP / 0 Atk / 30 SpA
- Hydro Pump
- Air Slash
- Hidden Power [Grass]
- Rain Dance

Magnemite @ Choice Scarf
Ability: Analytic
Level: 5
EVs: 240 SpA / 236 Spe
Modest Nature
IVs: 1 Atk / 30 SpA / 30 SpD
- Thunderbolt
- Flash Cannon
- Volt Switch
- Hidden Power [Ground]

Timburr @ Eviolite
Ability: Iron Fist
Level: 5
EVs: 116 Atk / 156 Def / 236 SpD
Careful Nature
- Drain Punch
- Knock Off
- Mach Punch
- Ice Punch

Snubbull @ Berry Juice
Ability: Intimidate
Level: 5
EVs: 36 HP / 36 Atk / 196 Def / 116 SpD / 116 Spe
Adamant Nature
- Play Rough
- Fire Punch
- Thief
- Thunder Wave

Onix @ Berry Juice
Ability: Sturdy
Level: 5
EVs: 76 HP / 236 Atk / 196 Spe
Jolly Nature
- Earthquake
- Rock Blast
- Taunt
- Stealth Rock

Fletchling
Ability: Gale Wings
Level: 5
EVs: 156 HP / 196 Atk / 92 Def / 52 SpD
Adamant Nature
- Acrobatics
- U-turn
- Swords Dance
- Roost

Mantyke, Scarf Magnemite, and Fletchling all have a shared checks. The goal of this team is to get down SR early and apply pressure with one of your three cleaners to weaken Chinchou / Porygon / etc so one the others can sweep the opposing team. Snubbull provides an all-around physical and fighting check, which is necessary for every team. The EV spread lives LO Diglett Earthquake after SR+Mienfoo U-Turn iirc. Timburr is your check to shell smashers and Pawniard. I chose to run Ice Punch+Iron Fist to pressure Foongus, as no member of the team can switch in easily. Losing Guts isn't too big because no one consciously burns a Timburr with Ponyta anyways. Onix provides a secondary flying resist, an electric immune to pivot into Chou / Mag, and SR, rounding out the remaining weaknesses.