Shadow Dugtrio

Shadow Dugtrio is painfully frail, to the point where using it is more of a liability than a help as it really doesn't back up its paper defenses with strong offenses. It's best to just look elsewhere.

Best PvE Offensive Moveset

• Mud Slap performs the best on offense.
• Sucker Punch has no use.
• Earthquake is the strongest charge move for offense. 
• Mud Bomb isn't that far behind, and may have more consistency due to it being a 3-bar move.
• Stone Edge is powerful but lacks STAB and general synergy. 

Best PvE Defensive Moveset

• Mud Slap slaps hard on defense, thanks to its high base power. 
• Sucker Punch is a decent alternative thanks to its relatively neutral Dark-typing.
• Mud Bomb can be used frequently, making it ideal for defense.
• Stone Edge provides wide Rock-type damage, and is hard to dodge.
• Earthquake is too slow for defense. 

Mud Slap generates energy slightly below average, but offers strong STAB damage output. Sucker Punch sports average energy gains and a relatively neutral Dark-typing, but lacks STAB. 

Mud Bomb costs the least amount of energy, gets STAB, and can be used frequently. It is generally more consistent than Earthquake, due to the latter's significant energy demands, though having a powerful KO threat is also quite valuable. Stone Edge is provides wide Rock-type coverage, though it is somewhat costly to use.