How can Gliscor and other tanks be countered in competitive battling?

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Ice-types and Ice Coverage: Strong Ice-types such as Kyurem-B and Weavile are able to outspeed and OHKO Gliscor. Similarly, Gliscor should be cautious of switching into Tapu Koko, Magearna, and Medicham, as they can all carry Ice-type coverage.Offensive Water-types: Offensive Water-types such as Greninja, Keldeo, and Gyarados can all threaten Gliscor with their powerful STAB moves and potentially use it as setup fodder. Defensive Water-types such as Mantine and Rotom-W can attempt to PP stall Gliscor; however, they should be wary of getting their item removed or getting afflicted by Taunt.Pokemon immune to Earthquake: Defensive Flying-types such as Celesteela and Zapdos are immune to Earthquake, but they do not appreciate their item being removed. Mega Latias and Mega Latios can both wall any set without Toxic and set up Calm Minds or OHKO Gliscor with Ice Beam. However, Flying-types that are suceptible to Toxic need to be wary of it when switching into Gliscor.Grass-types: Grass-types such as Tangrowth, Tapu Bulu, and Ferrothorn are all able to switch into Gliscor and exploit its passivity. Tapu Bulu with a Z-Crystal can freely switch in, set up a Swords Dance, and recover any damage with the combination of Horn Leech and Grassy Terrain. However, Grass-types do have to be warry of being broken by offensive sets or crippled by Toxic in the case of Tangrowth and Tapu Bulu.

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