Rain Dance
Joker's Revenge (Aggron-Mega) @ Aggronite
Ability: Sturdy
EVs: 252 HP / 172 Atk / 80 Def
Impish Nature
- Rain Dance
- Rock Tomb
- Metal Burst
- Earthquake
vs
click Rock Tomb 5 times (0.95^5=0.77% which is a surehit under BMT rules). Flare Blitz never 2HKOs while Rock Tomb does.
252+ Atk Tough Claws Charizard-Mega-X Flare Blitz vs. 252 HP / 80+ Def Aggron: 144-171 (41.8 - 49.7%) -- guaranteed 3HKO
172 Atk Aggron Rock Tomb vs. 0 HP / 0 Def Charizard-Mega-X: 152-180 (51.1 - 60.6%) -- guaranteed 2HKO
You can also click Rain Dance instead of Rock Tomb on turns 3-5 to trigger some OGPL memories but actually win this time.
Greninja has 285 HP, click Metal Burst, you never die thanks to Sturdy
252+ SpA Choice Specs Protean Greninja Hidden Power Electric vs. 252 HP / 0 SpD Aggron: 207-244 (60.1 - 70.9%) -- guaranteed 2HKO
Possible damage amounts: (207, 210, 211, 214, 217, 219, 222, 223, 226, 229, 231, 234, 237, 238, 241, 244)
Metal Burst does a minimum of 310 which kills.
252+ SpA Choice Specs Protean Greninja Hyper Beam vs. 252 HP / 0 SpD Aggron: 129-152 (37.5 - 44.1%) -- guaranteed 3HKO
If Hyper Beam is clicked, make sure to Rain Dance turn 2 to save PP on Metal Burst.
Mega and click Earthquake 3 times
172 Atk Aggron-Mega Earthquake vs. 248 HP / 28 Def Metagross-Mega: 150-178 (41.3 - 49%) -- guaranteed 3HKO
92+ Atk Tough Claws Metagross-Mega Power-Up Punch vs. 252 HP / 80+ Def Filter Aggron-Mega: 39-46 (11.3 - 13.3%) -- possible 8HKO
+1 92+ Atk Tough Claws Metagross-Mega Power-Up Punch vs. 252 HP / 80+ Def Filter Aggron-Mega: 58-69 (16.8 - 20%) -- possible 5HKO
+2 92+ Atk Tough Claws Metagross-Mega Thunder Punch vs. 252 HP / 80+ Def Aggron-Mega: 96-113 (27.9 - 32.8%) -- guaranteed 4HKO
92+ Atk Tough Claws Metagross-Mega Power-Up Punch vs. 252 HP / 80+ Def Filter Aggron-Mega: 39-46 (11.3 - 13.3%) -- possible 8HKO
+1 92+ Atk Tough Claws Metagross-Mega Thunder Punch vs. 252 HP / 80+ Def Aggron-Mega: 72-85 (20.9 - 24.7%) -- guaranteed 5HKO
+1 92+ Atk Tough Claws Metagross-Mega Thunder Punch vs. 252 HP / 80+ Def Aggron-Mega: 72-85 (20.9 - 24.7%) -- guaranteed 5HKO
neither line kills [for academic purposes a) is the better line]
You can click Rain Dance safely once without risk of dying although it may fail if the Metagross sets up the Rain first, which would be a moral defeat, so don't do that.