I would do Follow Me or Rage Powder. Wide Gaurd protects ONLY against moves such as Surf or Earthquake that would hit multiple targets. If the opposition is doing single-target attacks, Wide Guard is useless. Here is a Pokémon and a set to go with it for Rage Powder and Follow Me respectively:
Amoongus @ Black Sludge
Ability: Regenerator
EVs: 252 Def / 252 SpD / 4 HP
Calm / Bold Nature
- Rage Powder
- Synthesis
- Giga Drain
- Toxic
Togekiss @ Leftovers
Ability: Serene Grace / Hustle
EVs: 252 Def / 252 SpD / 4 HP
Calm / Bold Nature
- Follow Me
- Morning Sun
- Dazzling Gleam / Air Slash / Shadow Ball
- Toxic
These sets are pretty self-explanatory. For Amoongus, you mainly use Rage Powder to help Conkeldurr land Focus Punch as you planned, but it also has Giga Drain and Synthesis for HP recovery after soaking up all that punishment, and Toxic for support. Its Nature and EVs are all defensive, as it will probably be taking some serious beatings.
For Togekiss, it has the same strategy as Amoongus, with a higher damage potential.
I hope this helps!