Chinchou @ Berry Juice
Ability: Volt Absorb
Level: 5
EVs: 76 HP / 212 Def / 152 SpA
- Scald
- Volt Switch
- Ice Beam
- HP Ground / Heal Bell
236 Atk Doduo Knock Off (97.5 BP) vs. 76 HP / 212+ Def Chinchou: 9-11 (36 - 44%) -- guaranteed 3HKO
(9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11)
236 Atk Doduo Jump Kick vs. 76 HP / 212+ Def Chinchou: 10-12 (40 - 48%) -- guaranteed 3HKO
(10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 12)
152 SpA Chinchou Volt Switch vs. 0 HP / 0 SpD Doduo: 20-26 (100 - 130%) -- guaranteed OHKO
(20, 20, 20, 20, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 26)
If you are worried about diglett:
152 SpA Chinchou Ice Beam vs. 0 HP / 0 SpD Doduo: 20-24 (100 - 120%) -- guaranteed OHKO
(20, 20, 20, 20, 20, 20, 20, 22, 22, 22, 22, 22, 22, 22, 22, 24)
The only real issue with this is that it can be worn down if switched in on doduo multiple times. Chinchou overall is an incredibly useful pokemon so it functions v well outside of countering doduo