Originally Posted by Fat BLAZIKEN_57
The problem with Choice Band Dugtrio is that it's vulnerable to Pursuit users. If you Aerial Ace a Heracross, Tyranitar could Pursuit you to death. If you Earthquake Tyranitar, Heracross could Pursuit you to death. So I'd say that Choice Band is only necessary on "FUCK OFF, BLISSEY" special attacking teams.
That's sums up why I put Life Orb on it. I have several methods of dealing with Blissey, so while I would like the extra 20% attack boost, I don't want to risk being stuck with doing one move on such a fragile Pokemon that's easily taken down by Pursuit.