Alright, I'm going to reject this.
Dugtrio's niche is basically taking out Heatran. Yeah, it can mildly dent a few other Ground-weak things, but those things have to be substantially weakened for it to actually work. For reference:
252 Atk Dugtrio Earthquake vs. 4 HP / 0 Def Mega Tyranitar: 168-198 (49.1 - 57.8%) -- 96.5% chance to 2HKO
This is just unacceptable. If we're assuming, then, that its only truly reliable niche is taking out Heatran, then the rest of your team has to be comprised of Volcarona, Talonflame, and Slurpuff to justify using Dugtrio. Sure, it's fast, but there are stronger, faster Pokemon like Greninja, Deoxys-S, and Scarf Excadrill that do a lot better of a job doing what Dugtrio does, considering they can threaten Pokemon other than just Heatran.
Add that to the fact that Dugtrio can't switch into anything at all due to it's abysmal defenses (it stands a chance to be OHKO'd by Mega T-tar's Stone Edge, LOL), relies exclusively on Focus Sash (and a lack of entry hazards) to even be viable in the first place, is near-dead weight against any team that doesn't carry something it can prey on, and overall requires far more team support than it'll ever give back to function well. It's simply not something I would rely on to contribute to a match.
QC Rejected 1/3
Good analysis, but bad Pokemon.