Shadow Dusclops

Feint Attack or Hex + Shadow Punch and Ice Punch or Fire Punch

Feint Attack (3.0 DPT, 3.0 EPT) and Hex (2.0 DPT, 3.67 EPT) perform very similarly; the former returning well-rounded numbers without STAB, while the latter gives up raw damage for more energy gains but does get STAB. Generally speaking, the energy gain from Hex is more useful if Dusclops would need coverage from Ice Punch or Fire Punch, otherwise Feint Attack tends to better. As an example, if Dusclops faces Tropius in Great League under a one-shield scenario, Dusclops would lose with Feint Attack but win with Hex due to an additional Ice Punch from Hex's greater energy gains. 

Shadow Punch (1.14 DPE, 35 energy) is a very poor move from a stats perspective, but costs the least amount of energy and gets STAB, so it tends to get the most use. The choice between the two elemental punches is up to preference. They both cover 4 typings and have identical stats, but don't really help Dusclops deal with its own weaknesses.