Grumpig as a counter.
Grumpig @ Leftovers
Ability: Thick Fat
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Psychic
- Whirlwind
- Thunder Wave
- Heal Bell
Not much to say, Grumpig can switch into any move Raichu carries and defeat or phaze it.
252 SpA Raichu Thunderbolt vs. 252 HP / 252+ SpD Grumpig: 78-93 (21.4 - 25.5%) -- 0.3% chance to 4HKO
252 SpA Raichu Thunderbolt vs. 252 HP / 252+ SpD Grumpig: 78-93 (21.4 - 25.5%) -- 0.3% chance to 4HKO
0 SpA Grumpig Psychic vs. 0 HP / 4 SpD Raichu: 106-126 (40.6 - 48.2%) -- guaranteed 3HKO
You can also use Seismic Toss, Taunt, Toxic, etc. Volt Switches are annoying but Grumpig is still a full counter.

Grumpig @ Leftovers
Ability: Thick Fat
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Psychic
- Whirlwind
- Thunder Wave
- Heal Bell
Not much to say, Grumpig can switch into any move Raichu carries and defeat or phaze it.
252 SpA Raichu Thunderbolt vs. 252 HP / 252+ SpD Grumpig: 78-93 (21.4 - 25.5%) -- 0.3% chance to 4HKO
252 SpA Raichu Thunderbolt vs. 252 HP / 252+ SpD Grumpig: 78-93 (21.4 - 25.5%) -- 0.3% chance to 4HKO
0 SpA Grumpig Psychic vs. 0 HP / 4 SpD Raichu: 106-126 (40.6 - 48.2%) -- guaranteed 3HKO
You can also use Seismic Toss, Taunt, Toxic, etc. Volt Switches are annoying but Grumpig is still a full counter.