Originally Posted by Fat Pocket
I mean it certainly wouldn't hurt to be faster than min spe Tentacruel or Modest Politoed. Hell being faster than Adamant Breloom can be helpful, so it can Taunt it from setting up Swords Dance or Substitute, the moves that make it threatening in the first place. Being faster than Timid Magnezone is also noteworthy.
Why would Breloom attempt to set-up against Gliscor anyway? Gliscor is usually faster and carries Taunt, can possibly 2HKO with Ice Fang, and cannot be put to sleep, which is the way SD Breloom starts setting up 80% of the time anyway. If i had Breloom and i was facing a Gliscor in either a lead match-up or a double switch, i would never use Spore or SD. I would either go for the 2HKO with LO Bullet Seed or switch out, and being faster doesn't help in any case. What Modest Poltitoed are you talking about? Isn't Politoed running max HP and max SpA on the Specs and 3 attacks sets? And why is Gliscor staying in against Politoed anyway? Only case which you should stay in is against a heavily weakened Toed to OHKO with EQ, but you can still do that as Toed rarely uses Max Speed without Scarf. Timid Magnezone is easy to wall for stall teams, which defensive Gliscor is usually found in, not to mention that no sane Zone player would stay in against Gliscor.
Anyway i won't talk more in fear of becoming repetitive and tiring, but from my experience defensive Gliscor really appreciates the ability to deal with Terrakion much better, and in general have 19 more valuable Def points.