Garchomp as a threat.
Garchomp @ Firium Z
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Swords Dance
- Earthquake
- Dragon Claw
- Fire Fang
Garchomp has fallen from grace but can still pose a threat to this core. Firium Z may be an unusual and subar option but it is used on this set to break through 'mons such as Celesteela, Skamory and Tapu Bulu.
After an SD a +2 Dragon Claw does a significant amount of damage to Mantine, OHKOing after rocks:
+2 252 Atk Garchomp Dragon Claw vs. 248 HP / 52 Def Mantine: 327-385 (87.6 - 103.2%) -- guaranteed OHKO after Stealth Rock and Leftovers recovery
If rocks aren't up then it is possible for Mantine to haze away Garchomp's boosts but it will die to the next Dragon Claw.
Ferrothorn fails to 2hko Garchomp with its strongest option being Power Whip:
0 Atk Ferrothorn Power Whip vs. 4 HP / 0 Def Garchomp: 127-151 (35.4 - 42.1%) -- guaranteed 3HKO
Meaning Garchomp can set up on it if need be.
Meanwhile Garchomp, after a boost, OHKO's Ferrothorn with Fire Fang or an Inferno Overdrive:
+2 252 Atk Garchomp Fire Fang vs. 252 HP / 88+ Def Ferrothorn: 384-452 (109 - 128.4%) -- guaranteed OHKO
+2 252 Atk Garchomp Inferno Overdrive (120 BP) vs. 252 HP / 88+ Def Ferrothorn: 700-828 (198.8 - 235.2%) -- guaranteed OHKO after Stealth Rock and Leftovers recovery
In the scenario that Mantine managed to remove Garchomp's boost before switching out or dying Garchomp still poses a threat to the core because even an unboosted Z-move OHKO's Ferrothorn:
252 Atk Garchomp Inferno Overdrive (120 BP) vs. 252 HP / 88+ Def Ferrothorn: 352-416 (100 - 118.1%) -- guaranteed OHKO after Stealth Rock and Leftovers recovery