>>42443428Morpeko has a good enough attack stat that you can run Adamant sets with +1 speed due to Aura Wheel.
Aura Wheel changing type each turn is actually a benefit, as it won't be walled by Electric or Dark resists and has something that can stop both. It being unreliable STAB is fine because it is a 110 power move with no other drawback.
Morpeko also has a plethora of good moves, both utility and coverage. Parting Shot, Rapid Spin, Fake Out, Super Fang, elemental fangs including Psychic, Seed Bomb, Stomping Tantrum (for Doubles). and its STAB moves.
Morpeko is basically a hybrid of Pachirisu (utility and biting moves) and Togedemaru (high physical attack and speed), but is more offensive due to its Dark-typing.
Electric/Dark with coverage is stupidly good, as there aren't too many things that resist them both (especially when taking coverage into account).