Sheer Force Mawile's effectiveness

Detailed Result on Gliscor:
4 SpA Brave Sheer Force Life Orb Mawile Ice Beam vs 252 HP/0 SpD Impish Gliscor: 102.82% - 120.9%
100% chance to OHKO

Possible HP Damage: 364, 368, 372, 376, 384, 388, 392, 396, 400, 404, 408, 412, 416, 420, 424, 428

Detailed Result versus Mawile:
0 Atk Impish Poison Heal Gliscor Earthquake vs 252 HP/0 Def Brave Mawile: 77.96% - 92.76%
Stealth Rock damage: 19
After entry hazards: 256 - 301 (84.21% - 99.01%)
2 hits to KO

Possible HP Damage: 237, 240, 243, 246, 249, 252, 255, 258, 261, 264, 267, 270, 273, 276, 279, 282

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As you can infer from these calculations, Mawile cleanly KOes Gliscor with Life Orb Sheer Force Ice Beam, while Gliscor's STAB super-effective Earthquake does not KO after Stealth Rock damage. However, if Gliscor set up a Swords Dance or its Earthquake was a critical hit, Mawile won't make it.

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Detailed Result:
4 SpA Brave Sheer Force Life Orb Mawile Fire Blast vs 252 HP/0 SpD Impish Skarmory: 73.05% - 86.23%
Stealth Rock damage: 41
After entry hazards: 285 - 329 (85.33% - 98.5%)
2 hits to KO (with Leftovers)

Possible HP Damage: 244, 248, 250, 252, 256, 258, 262, 264, 268, 270, 274, 276, 278, 282, 284, 288

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These calculations prove that Mawile cleanly 2HKOes Skarmory with Life Orb Sheer Force Fire Blast after Stealth Rock damage, even factoring Roost. If Skarmory sets up Spikes, it can only switch out, at that point, it is weakened enough for someone else to clean up. If it decides to Roost, unless Fire Blast misses, Mawile finishes off Skarmory.

To show you that a Roosting Skarmory is dead weight if Stealth Rock is set up, consider the following:

- Skarmory comes in with 87.5% HP.

- Mawile uses Fire Blast as it begins to Spike-stack.

- Skarmory now has 20.7% HP left (after Leftovers recovery).

- Skarmory Roosts and now has 70.7% HP. However, the minimum damage that Mawile can do with Fire Blast is 73.05%.

- If Fire Blast does not miss, Mawile removes Skarmory from the game.

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Detailed Result on Skarmory:
4 SpA Brave Sheer Force Life Orb Mawile Fire Blast vs 252 HP/252 SpD Careful Skarmory: 49.1% - 58.08%
Stealth Rock damage: 41
After entry hazards: 205 - 235 (61.38% - 70.36%)
2 hits to KO (with Leftovers)

Possible HP Damage: 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194

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Unfortunately, Mawile cannot defeat Specially Defensive Skarmory. It will keep Roosting until you run out of Fire Blast PP.

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Detailed Result on Ferrothorn:
4 SpA Brave Sheer Force Life Orb Mawile Fire Blast vs 252 HP/208 SpD Relaxed Ferrothorn: 77.27% - 90.91%
2 hits to KO (with Leftovers)

Possible HP Damage: 272, 276, 280, 280, 284, 288, 292, 296, 296, 300, 304, 308, 312, 312, 316, 320

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Mawile has the ability to 2HKO Ferrothorn with Life Orb Sheer Force Fire Blast.

In this scenario, Mawile Fire Blasts Ferrothorn and Ferrothorn Leech Seeds Mawile. Let's consider the following:

- Ferrothorn comes in with 100% HP.

- Mawile uses Fire Blast. Ferrothorn survives and uses Leech Seed.

- At this point, Ferrothorn has 41.48% HP after Leftovers and Leech Seed recovery.

- Ferrothorn uses Protect. Now, Ferrothorn has 60.23% HP.

- Ferrothorn uses Protect again. Ferrothorn now has 78.98% HP.

- Ferrothorn uses Protect once more, but failed. At this point, Mawile has to deal at least 79.54% to Ferrothorn with Fire Blast or Mawile will have to start all over again.