The central strategy is to prepare a Venomoth sweep by utilising residual damage, sleep and Pokemon that can stall.
Drifblim (M) @ Petaya Berry
Ability: Unburden
EVs: 6 HP/252 Spd/252 SDef
Timid nature (+Spd, -Atk)
- Calm Mind
- Hypnosis
- Baton Pass
- Substitute
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This basically sets up as...