S Rank
Chansey: Not beaten
252 Atk Mega Diancie Close Combat vs. 4 HP / 252+ Def Eviolite Fur Coat Chansey: 204-240 (31.7 - 37.3%) -- guaranteed 3HKO after Stealth Rock
Mega Mewtwo Y: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 4 Def Mega Mewtwo Y: 159-187 (45 - 52.9%) -- guaranteed 2HKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 4 Def Mega Mewtwo Y: 318-375 (90 - 106.2%) -- guaranteed OHKO after Stealth Rock
Mega Rayquaza: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 0 Def Mega Rayquaza: 236-282 (67.2 - 80.3%) -- 43.8% chance to OHKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 0 Def Mega Rayquaza: 476-564 (135.6 - 160.6%) -- guaranteed OHKO
A+ Rank
Giratina: Beaten
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 248 HP / 252+ SpD Giratina: 450-530 (89.4 - 105.3%) -- guaranteed OHKO after Stealth Rock
Mega Mewtwo X: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 4 Def Mega Mewtwo X: 236-282 (66.8 - 79.8%) -- guaranteed 2HKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 4 Def Mega Mewtwo X: 474-560 (134.2 - 158.6%) -- guaranteed OHKO
Mega Gengar: Not Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 0 Def Mega Gengar: 72-84 (27.5 - 32.1%) -- 73.4% chance to 3HKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 0 Def Mega Gengar: 144-169 (55.1 - 64.7%) -- guaranteed 2HKO after Stealth Rock
252 SpA Spooky Plate Mega Gengar Judgment vs. 0 HP / 0- SpD Mega Diancie: 246-291 (102 - 120.7%) -- guaranteed OHKO
A Rank
Aegislash: Possibly beaten (depending on sets)
252 Atk Mega Diancie Precipice Blades vs. 252 HP / 4 Def Aegislash-Shield: 214-254 (66 - 78.3%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
4 SpA Mega Diancie Blue Flare vs. 252 HP / 252+ SpD Aegislash-Shield: 154-182 (47.5 - 56.1%) -- 81.6% chance to 2HKO after Stealth Rock and Leftovers recovery
Red Orb Groudon: Not beaten
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 152 HP / 104 SpD Primal Groudon: 173-204 (45.6 - 53.8%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Primal Groudon Thousand Arrows vs. 0 HP / 0 Def Mega Diancie: 380-450 (157.6 - 186.7%) -- guaranteed OHKO
Mega Audino: Beaten
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 248 HP / 252+ SpD Mega Audino: 217-256 (53 - 62.5%) -- guaranteed 2HKO after Stealth Rock and Poison Heal
Mega Tyranitar: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 136 HP / 0 Def Mega Tyranitar: 168-198 (44.8 - 52.8%) -- 19.1% chance to 2HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 136 HP / 0 Def Mega Tyranitar: 336-396 (89.6 - 105.6%) -- guaranteed OHKO after Stealth Rock
Registeel: Possibly beaten (depending on sets)
252 Atk Mega Diancie Precipice Blades vs. 248 HP / 252+ Def Registeel: 166-196 (45.7 - 53.9%) -- 46.9% chance to 2HKO after Stealth Rock and Leftovers recovery
252 Atk Mega Diancie Precipice Blades vs. 248 HP / 8 Def Registeel: 214-252 (58.9 - 69.4%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
252 Atk Mega Diancie Close Combat vs. 248 HP / 252+ Def Registeel: 166-196 (45.7 - 53.9%) -- 46.9% chance to 2HKO after Stealth Rock and Leftovers recovery
252 Atk Mega Diancie Close Combat vs. 248 HP / 8 Def Registeel: 214-252 (58.9 - 69.4%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
4 SpA Mega Diancie Blue Flare vs. 248 HP / 252+ SpD Registeel: 154-182 (42.4 - 50.1%) -- 0.4% chance to 2HKO after Stealth Rock and Leftovers recovery
4 SpA Mega Diancie Blue Flare vs. 248 HP / 8 SpD Assault Vest Registeel: 132-156 (36.3 - 42.9%) -- guaranteed 3HKO after Stealth Rock
A- Rank
Dialga: Possibly beaten (depending on sets)
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 248 HP / 252+ Def Dialga: 76-90 (18.8 - 22.3%) -- possible 6HKO after Stealth Rock and Leftovers recovery
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 248 HP / 252+ Def Dialga: 153-180 (37.9 - 44.6%) -- guaranteed 3HKO after Stealth Rock and Leftovers recovery
4 SpA Pixie Plate Pixilate Mega Diancie Techno Blast vs. 248 HP / 8 SpD Dialga: 301-355 (74.6 - 88%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
252 Atk Mega Diancie Precipice Blades vs. 248 HP / 252+ Def Dialga: 194-230 (48.1 - 57%) -- 90.2% chance to 2HKO after Stealth Rock and Leftovers recovery
252 Atk Mega Diancie Close Combat vs. 248 HP / 252+ Def Dialga: 194-230 (48.1 - 57%) -- 90.2% chance to 2HKO after Stealth Rock and Leftovers recovery
Mega Latias: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 0 Def Mega Latias: 204-242 (67.7 - 80.3%) -- guaranteed 2HKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 0 Def Mega Latias: 408-482 (135.5 - 160.1%) -- guaranteed OHKO
Mega Latios: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 4 Def Mega Latios: 236-282 (78.9 - 94.3%) -- 43.8% chance to OHKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 4 Def Mega Latios: 474-560 (158.5 - 187.2%) -- guaranteed OHKO
Shedinja: Possibly beaten (depending on sets)
B+ Rank
Arceus: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 248 HP / 0 Def Arceus: 102-121 (23 - 27.3%) -- possible 6HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 248 HP / 0 Def Arceus: 204-241 (46 - 54.4%) -- 54.3% chance to 2HKO after Stealth Rock and Poison Heal
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 248 HP / 0 SpD Arceus: 303-357 (68.3 - 80.5%) -- guaranteed 2HKO after Stealth Rock and Poison Heal
252+ Atk Arceus Facade (140 BP) vs. 0 HP / 0 Def Mega Diancie: 109-129 (45.2 - 53.5%) -- 35.2% chance to 2HKO
Kyogre: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 156 HP / 0 Def Kyogre: 130-154 (34.2 - 40.5%) -- 44.5% chance to 3HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 156 HP / 0 Def Kyogre: 261-307 (68.6 - 80.7%) -- guaranteed 2HKO after Stealth Rock and Poison Heal
Kyurem-B: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 240 HP / 0 Def Kyurem-B: 236-282 (52.3 - 62.5%) -- guaranteed 2HKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 240 HP / 0 Def Kyurem-B: 476-564 (105.5 - 125%) -- guaranteed OHKO
Yveltal: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 252 HP / 128 Def Yveltal: 218-258 (47.8 - 56.5%) -- guaranteed 2HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 252 HP / 128 Def Yveltal: 438-516 (96 - 113.1%) -- guaranteed OHKO after Stealth Rock
B Rank
Mega Garchomp: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 252 HP / 0 Def Mega Garchomp: 212-252 (50.4 - 60%) -- 84.8% chance to 2HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 252 HP / 0 Def Mega Garchomp: 422-500 (100.4 - 119%) -- guaranteed OHKO
Mega Gyarados: Beaten
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 252 HP / 0 SpD Mega Gyarados: 564-666 (143.1 - 169%) -- guaranteed OHKO
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 212 HP / 0 Def Mega Gyarados: 218-260 (56.7 - 67.7%) -- guaranteed 2HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 212 HP / 0 Def Mega Gyarados: 444-524 (115.6 - 136.4%) -- guaranteed OHKO
Regigigas: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 252 HP / 0 Def Regigigas: 109-130 (25.7 - 30.6%) -- possible 5HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 252 HP / 0 Def Regigigas: 220-259 (51.8 - 61%) -- guaranteed 2HKO after Stealth Rock and Poison Heal
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 252 HP / 0 SpD Regigigas: 327-385 (77.1 - 90.8%) -- 25% chance to OHKO after Stealth Rock
252+ Atk Regigigas Facade (140 BP) vs. 0 HP / 0 Def Mega Diancie: 135-159 (56 - 65.9%) -- guaranteed 2HKO
Slaking: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 252 HP / 4 Def Slaking: 118-141 (23.4 - 27.9%) -- possible 5HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 252 HP / 4 Def Slaking: 237-280 (47 - 55.5%) -- 76.2% chance to 2HKO after Stealth Rock and Poison Heal
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 252 HP / 0 SpD Slaking: 502-592 (99.6 - 117.4%) -- guaranteed OHKO after Stealth Rock
252+ Atk Slaking Facade (140 BP) vs. 0 HP / 0 Def Mega Diancie: 135-159 (56 - 65.9%) -- guaranteed 2HKO
B- Rank
Gengarite Gengar: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 0 Def Mega Gengar: 72-84 (27.5 - 32.1%) -- 73.4% chance to 3HKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 0 Def Mega Gengar: 144-169 (55.1 - 64.7%) -- guaranteed 2HKO after Stealth Rock
Ho-Oh: Possibly beaten (depending on sets)
252 Atk Mega Diancie Thousand Arrows vs. 252 HP / 4 Def Ho-Oh: 248-294 (59.6 - 70.6%) -- guaranteed 2HKO
Mega Blaziken: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 0 HP / 0 Def Mega Blaziken: 144-169 (47.8 - 56.1%) -- guaranteed 2HKO after Stealth Rock
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 0 HP / 0 Def Mega Blaziken: 288-339 (95.6 - 112.6%) -- guaranteed OHKO after Stealth Rock
Mega Metagross: Not beaten (tho tbh idk what this runs, assuming reven vest but idkkk im like 99% sure this wins 1v1 tho)
4 SpA Mega Diancie Blue Flare vs. 248 HP / 8 SpD Assault Vest Mega Metagross: 172-204 (47.3 - 56.1%) -- guaranteed 2HKO after Stealth Rock
252 Atk Mega Diancie Precipice Blades vs. 248 HP / 0 Def Mega Metagross: 214-254 (58.9 - 69.9%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Mega Metagross Gear Grind (2 hits) vs. 0 HP / 0 Def Mega Diancie: 728-864 (302 - 358.5%) -- guaranteed OHKO
Regirock: Beaten
4 SpA Pixie Plate Pixilate Mega Diancie Boomburst vs. 248 HP / 136 SpD Assault Vest Regirock: 207-244 (57 - 67.2%) -- guaranteed 2HKO after Stealth Rock
Xerneas: Beaten
252 Atk Pixie Plate Pixilate Mega Diancie Fake Out vs. 252 HP / 0 Def Xerneas: 124-147 (27.1 - 32.2%) -- 2.2% chance to 4HKO after Stealth Rock and Poison Heal
252 Atk Pixie Plate Pixilate Mega Diancie Extreme Speed vs. 252 HP / 0 Def Xerneas: 249-294 (54.6 - 64.4%) -- guaranteed 2HKO after Stealth Rock and Poison Heal