Gliscor is a generally fast Ground Type. Good Atk. & Ground/Flying (I think that's the typing) is pretty good typing! Dugtrio could be speedy with good EVs!
I love Gliscor. I have one that I bred/trained myself and I often use it to solo the pokemon league. I have also considered dugtrio, but its main best stat is speed.
I have been using Garchomp more lately, now that my Hydreigon will have 5 weaknesses....It has been working out well also.