Dedenne

Dedenne is an cute addition to Pokemon Go, much adored by fans from other Pokemon titles. Unfortunately Dedenne lacks stats to be useful in the PvE meta, leaving it to be mostly a niche in the PvP scene. 

Best PvE Offensive Moveset

• Thunder Shock gets STAB and suits Dedenne's Electric-type role.
• Tackle doesn't have any use and can't be Super Effective.
• Discharge synergizes well with Dedenne's Fast Move and can be used frequently. 
• Play Rough gets STAB but Dedenne has no Fairy-type Fast Move to compliment it. 
• Parabolic Charge is not a strong move.

Best PvE Defensive Moveset

• Thunder Shock gets STAB and generates energy faster to beat Tackle on defense, but neither deal impressive damage.
• Discharge is more valuable on defense as a 3-bar move.
• Play Rough can hit Ground-type attackers for neutral damage at least. 
• Parabolic Charge is basically Discharge, but weaker.

Thunder Shock offers very high energy generation, with low damage output despite benefiting from STAB. Tackle is a poor move and can't be Super Effective against anything. 

Dedenne only has two Charge Moves available, and therefore those are its only options. Discharge costs a moderate amount of energy and provides STAB Electric-type coverage, while Play Rough demands more energy and hits harder with Fairy-type coverage.