Return still does more damage to Gliscor, but can't 2KO 252/200 Impish variants.
Quite frankly, Gliscor needs defense to be able to take on Doryuzu and Terakion. Otherwise after +2 he gets slammed (god really, do you want max hp/max speed Gliscor to be OHKOED by Life Orb Terakion Stone Edge? Even 353 Hp/350 Defense has over 50% chance of being ohkoed with Stealth Rock. Terakion almost forces you to run defensive. Swords Dance Adamant Balloon Doryuzu can also 2 hit ko non defensive Gliscor after Stealth Rock with Rock Slide and if you get flinched, you won't even pop the Balloon.)
Gliscor NEEDS defense this time around.
And Gliscor can be a shaky counter to Doryuzu, especially if there's a Landlos waiting in the wings. There is only so many times Gliscor can switch in before dying and if Landlos is carrying Hp Ice or Swords Dance, Gliscor might not be switching in no more (and if you're unlucky enough to be hit by a critical +2 Stone Edge, you're dead although that is some fantastic luck. It will always at the least 2 hit ko you though while Gliscor won't ohko.)
And Gliscor can be a shaky counter to Doryuzu, especially if there's a Landlos waiting in the wings. There is only so many times Gliscor can switch in before dying and if Landlos is carrying Hp Ice or Swords Dance, Gliscor might not be switching in no more (and if you're unlucky enough to be hit by a critical +2 Stone Edge, you're dead although that is some fantastic luck. It will always at the least 2 hit ko you though while Gliscor won't ohko.)
If Gliscor can take on Doryuuzu, then it can take on RPTerakion and Landlos as well. It is already unable to take a +2 LO Stone Edge from Terakion and any good players will scout for HP Ice before throwing Gliscor into Landlos.
It is likely to have trouble taking on Doryuzu+Landlos/Terakion and don't many Terakion Double Dance? Also for sheer irony, I recall a kinky Cheer Up Terakion set (the only way to win is by anything faster obviously but being able to destroy Gliscor is a plus) with with Hp Ice that obviously Gliscor won't enjoy. If Gliscor doesn't switch in on Landlos, what is (I imagine Starmie or Latios since the Drizzle+Swift Swim ban made him even more powerful and he was phenomenal then and it could Rock Polish. However Latias/Latios could survive the Stone Edge because of the unstab but if they receive things like Scizor Bullet Punch in support they're dead and Landlos could just attack on the switch as well and come in later for death).
Landlos/Terakion+ Doryuzu is beastly and they wear each other's counters out and are very fast. Gliscor has a tendency to be worn down then and it is quite possible to lose it to flinches or surpises. Gliscor itself can handle Doryuzu usually fine but in combinations with Doryuzu's friends and being worn down, it can lose.
I don't deny that one on one Gliscor almost always beats Doryuzu (barring very unlucky flinches). But it does have to beware of the situational hazards and being worn down and sometimes it isn't possible to keep Gliscor in reserve if you need it to take hits from something else. That's why everyone knows the best Doryuzu come in endgame when everything is weakened (sometimes that isn't possible either but it sure will try) and it mows over the last of the resistance.
At the extreme risk of derailing off Doryuzu (which already happened most likely), wouldn't Protect become predictable on Gliscor switching in on Landlos and it would grab a Swords Dance/Rock Polish/Fire off Hp Ice after the Protect?
Rotom-W does also die to Swords Dance Landlos (but then, you're not switching Rotom in on Landlos I think). Also, I think most Landlos (except Bulk Up which are also tough) do run Life Orb. However Rotom-W is an awesome pokemon and can be a Doryuzu counter...if it wasn't for the chance of flinch since it can 2 hit ko you with +2 Rock Slide. But Dragonite has that problem too (and is reliant on Multi-Scale being up) but those flinches certainly can make certain counters shaky. And if Hydro Pump misses (that would suck), it kills you as well. I think if I'm adding probabilities right that is a 50/50 of killing Doryuzu or dying (3/10 flinch+1/5 Hydro Pump miss).
Considering that the main Gliscor set in the analysis runs SD over Protect, I'd say that HP Ice has come to be more expected on Landlos than Protect on Gliscor (this is true in my experience at least).
And Doryuuzu has a mere 5% chance to 2HKO with +2 Jolly SD, meaning that Rotom-W has 2 tries for Hydro Pump (not sure why you'd WoW when HP is more accurate and will do the job regardless). Remember that Rock Slide, too, does not have perfect accuracy, so I find Rotom-W to be a viable check. Rotom-C (Electric/Grass) can also do the job, though it relies on WoW to do it.
Not any people run adamant anymore so they can "outspeed" other Excadrills. But your point still stands.EQ from max atk Adamant LO Dory does 49% - 58% to 252/252 Quagsire, so no, Unaware Quagsire cannot safely counter Dory.
Not any people run adamant anymore so they can "outspeed" other Excadrills. But your point still stands.
Why would Excadrill ever be at +1?Oh, in that case, bulky Gyarados is a decent counter. It can take a +1 Rock Slide + SR + SS damage with HP to spare and OHKO with Waterfall.
Why would Excadrill ever be at +1?