Gastrodon @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
-Scald
-Earth Power
-Recover
-Toxic
Gastrodon serves as a
check here. Kingler's Liquidation does nothing and Knock Off does 38% max to get rid of the lefties on Gastro. After that, Superpower is it's best weapon and decreases in damage with each use and by that time, Gastro gets all that HP back.
252+ Atk Life Orb Kingler Knock Off (97.5 BP) vs. 252 HP / 252+ Def Gastrodon: 139-164 (32.6 - 38.4%) -- 98.4% chance to 3HKO
(with Leftovers on Gastrodon)
252+ Atk Life Orb Kingler Knock Off vs. 252 HP / 252+ Def Gastrodon: 94-110 (22 - 25.8%) -- 3.3% chance to 4HKO
(with Leftovers knocked off)
252+ Atk Life Orb Kingler Superpower vs. 252 HP / 252+ Def Gastrodon: 170-201 (39.9 - 47.1%) -- guaranteed 3HKO
(max damage before drops)
Gastrodon, however, hits Kingler hard with EP. Even at uninvested SpA:
0 SpA Gastrodon Earth Power vs. 0 HP / 0 SpD Kingler: 157-186 (62.5 - 74.1%) -- guaranteed 2HKO
You could try and be fancy and show off by trying to burn Kingler with Scald but it's not necessary!