Chesnaught as a
check.
Chesnaught @ Leftovers / Rocky Helmet
Ability: Bulletproof
EVs: 248 HP / 4 Atk / 252 Def
Impish Nature
- Leech Seed
- Spiky Shield
- Spikes
- Wood Hammer / Hammer Arm
Combining his good bulk and typing, Chesnaught does not only tanks Mega Absol's main STABs and coverage pretty well, as it can scare Mega Absol easily, since Chesnaught both STABs hits Absol with a great power.
The only real situations that gives problems to Chesnaught, happen when he takes a Play Rough (and the underrated Fire Blast) in the switch, specially considering the fact of Chesnaught doesn't have a reliable form of recovery, and it can't depend of Leech Seed because of Magic Bounce. So he can't switch in too many times into Mega Absol, along with the Knock Off + residual damage from Stealth Rock in the progress of the match.
However, if Mega Absol decides to forgo Play Rough, Chesnaught represents a hard stop against Absol, taking only ~50%~ from Superpower at +2, and giving a 2HKO / OHKO against Absol easily, with Wood Hammer / Hammer Arm, respectively.
Defensive Calcs:
252 Atk Mega Absol Play Rough vs. 240 HP / 252+ Def Chesnaught: 138-164 (36.6 - 43.5%) -- guaranteed 3HKO after Stealth Rock and Leftovers recovery
+2 252 Atk Mega Absol Sucker Punch vs. 240 HP / 252+ Def Chesnaught: 91-108 (24.1 - 28.6%) -- 0.4% chance to 4HKO after Stealth Rock and Leftovers recovery
+2 252 Atk Mega Absol Knock Off (97.5 BP) vs. 240 HP / 252+ Def Chesnaught: 110-130 (29.1 - 34.4%) -- guaranteed 4HKO after Stealth Rock and Leftovers recovery
+2 252 Atk Mega Absol Superpower vs. 240 HP / 252+ Def Chesnaught: 182-215 (48.2 - 57%) -- 91.8% chance to 2HKO after Stealth Rock and Leftovers recovery
+2 252 Atk Mega Absol Play Rough vs. 240 HP / 252+ Def Chesnaught: 274-324 (72.6 - 85.9%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
Offensive Calcs:
0 Atk Chesnaught Wood Hammer vs. 0 HP / 0 Def Mega Absol: 207-244 (76.3 - 90%) -- guaranteed 2HKO
0 Atk Chesnaught Hammer Arm vs. 0 HP / 0 Def Mega Absol: 344-408 (126.9 - 150.5%) -- guaranteed OHKO