Sirfetch'd

Honorable and true, Sirknight is the shining beacon of Pokemon Go, wielding its shining leek and leaf shield in a battle against all Dark Types that stand against it!

...that said, it's not exactly a good Pokemon in PvE. Just use Machamp or Conkeldurr.

Best PvE Offensive Moveset

• Counter and Close Combat allow our brave duck-knight to Fight the wrongs in this world
• Fury Cutter enables our good Sirfetch'dt to charge its most noble energy more quickly, though it does him no true favors in battle.
• Leaf Blade is a worthy attack, but Sirfetch'd is not skilled in its fabled art on offense
• Despite the bravery that it always shows within battle, Brave Bird is not Sirfetch'd chosen art.
• Night Slash is beneath the good Sirfetch'd noble deeds.

Best PvE Defensive Moveset

• Counter is the fast move that allows Sirfetch'd's shining onion to obtain honor.
• Fury Cutter is not an honorable way to defend.
• Leaf Blade is the skill that allows Sirfetch'd to defend with honor.
• Night Slash is a dishonorable move, but a desperate Sirfetch'd may make use of it in last resort
• Close Combat and Brave Bird offer no service to brave Sirfetch'd 

Counter is generally the more preferred fast move due to its superior STAB damage and relevant coverage. Fury Cutter generates energy slightly faster, but not dealing as much damage makes it a downgrade in many cases. 

Leaf Blade is one of the most efficient charge moves in the game, costs the least amount of energy, and can be used frequently. Close Combat takes advantage of STAB to threaten massive damage, though its self-debuff makes it difficult to use. Night Slash may offer valuable coverage depending on the format you play in, but its damage output is not very impressive. Brave Bird costs the most amount of energy and is not a good move compared to other options.