There's one big reason why nobody used Drifblim, and that's because it was an evolution of a Pokemon that you could only find on Fridays in an area you had no reason to revisit (and the best part is if you cleared it on a Friday, Drifloon won't even show up until the next Friday). By the time that Drifloon actually showed it, it was so underleveled that you'd have to make a concerted effort to actually use it.
""Love" is making a shot to the knees of a target 120 kilometers away using an Aratech sniper rifle with a tri-light scope." HK-47