Iron Head:
180 Atk Jirachi Iron Head vs. 0 HP / 68 Def Landorus-Therian: 105-124 (32.9 - 38.8%) -- 99.7% chance to 3HKO
(eq does 77-91)
+1 180 Atk Jirachi Iron Head vs. 248 HP / 252+ Def Eviolite Chansey: 204-240 (29 - 34.1%) -- 2% chance to 3HKO
+1 180 Atk Jirachi Iron Head vs. 248 HP / 16 Def Tapu Fini: 135-159 (39.3 - 46.3%) -- guaranteed 3HKO after Leftovers recovery
+1 180 Atk Jirachi Iron Head vs. 252 HP / 4 Def Tornadus-Therian: 184-217 (50.8 - 59.9%) -- guaranteed 2HKO
+1 180 Atk Jirachi Iron Head vs. 248 HP / 28 Def Magearna: 133-157 (36.6 - 43.2%) -- guaranteed 3HKO
+1 180 Atk Jirachi Iron Head vs. 252 HP / 4 Def Latias-Mega: 132-156 (36.2 - 42.8%) -- guaranteed 3HKO
+1 180 Atk Jirachi Iron Head vs. 248 HP / 8 Def Sableye-Mega: 127-150 (41.9 - 49.5%) -- guaranteed 3HKO (252 attack would have 17.2% chance to 2HKO)
+1 180 Atk Jirachi Iron Head vs. 0 HP / 0 Def Garchomp: 160-190 (44.8 - 53.2%) -- 32% chance to 2HKO (252 atk: 88.3%)
+1 180 Atk Jirachi Iron Head vs. 0 HP / 4 Def Medicham-Mega: 175-207 (67 - 79.3%) -- guaranteed 2HKO (hjk does 77-91 back)
+1 180 Atk Jirachi Iron Head vs. 168 HP / 0 Def Tyranitar-Mega: 218-258 (56.9 - 67.3%) -- guaranteed 2HKO
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Fire Punch:
+1 180 Atk Jirachi Fire Punch vs. 252 HP / 24 Def Ferrothorn: 300-356 (85.2 - 101.1%) -- 43.8% chance to OHKO after Stealth Rock (12.5% without)
+1 180 Atk Jirachi Fire Punch vs. 4 HP / 0 Def Excadrill: 292-344 (80.6 - 95%) -- guaranteed 2HKO (eq does 74-87)
+1 180 Atk Jirachi Fire Punch vs. 248 HP / 16+ Def Scizor-Mega: 260-308 (75.8 - 89.7%) -- guaranteed 2HKO (it can't do much to you in return tho; Knock + BP does 47 max)
+1 180 Atk Jirachi Fire Punch vs. 248 HP / 28 Def Celesteela: 182-216 (45.8 - 54.4%) -- 96.9% chance to 2HKO after Stealth Rock and Leftovers recovery (needs to be weakened otherwise it can leech seed you)
+1 180 Atk Jirachi Fire Punch vs. 248 HP / 28 Def Magearna: 168-198 (46.2 - 54.5%) -- 8.2% chance to 2HKO after Leftovers recovery (Iron Head + Fire Punch does 84-98)
+1 180 Atk Jirachi Fire Punch vs. 92 HP / 0 Def Mawile-Mega: 158-188 (59.8 - 71.2%) -- guaranteed 2HKO (watch out for Knock and Sucker)
+1 180 Atk Jirachi Fire Punch vs. 4 HP / 0 Def Magnezone: 170-202 (60.2 - 71.6%) -- guaranteed 2HKO (specs tbolt does 57 max)
+1 180 Atk Jirachi Fire Punch vs. 248 HP / 0 Def Jirachi: 192-228 (47.6 - 56.5%) -- 32.4% chance to 2HKO after Leftovers recovery (can barely touch you in return tho, and risks burn chip if it tries to wish stall)
+1 180 Atk Jirachi Fire Punch vs. 248 HP / 212+ Def Tangrowth: 124-146 (30.7 - 36.2%) -- guaranteed 4HKO after Leftovers recovery (def needs to be removed as it can sleep powder)
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Energy Ball:
+1 76 SpA Jirachi Energy Ball vs. 252 HP / 4 SpD Unaware Quagsire: 396-468 (100.5 - 118.7%) -- guaranteed OHKO
+1 76 SpA Jirachi Energy Ball vs. 0 HP / 0 SpD Greninja-Ash: 278-328 (97.5 - 115%) -- 81.3% chance to OHKO
+1 76 SpA Jirachi Energy Ball vs. 252 HP / 0 SpD Rotom-Wash: 198-234 (65.1 - 76.9%) -- guaranteed 2HKO after Leftovers recovery
+1 76 SpA Jirachi Energy Ball vs. 248 HP / 40+ SpD Tapu Fini: 146-174 (42.5 - 50.7%) -- guaranteed 3HKO after Leftovers recovery
+1 76 SpA Jirachi Energy Ball vs. 0 HP / 4 SpD Swampert: 456-540 (133.7 - 158.3%) -- guaranteed OHKO
+1 76 SpA Jirachi Energy Ball vs. 248 HP / 252+ SpD Gastrodon: 340-404 (80 - 95%) -- guaranteed 2HKO after Leftovers recovery
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ZHB:
+1 252 Atk Jirachi Zen Headbutt vs. 252 HP / 4 Def Toxapex: 228-270 (75 - 88.8%) -- guaranteed 2HKO after Black Sludge recovery
this is literally the only thing you need psychic coverage for lol (ZHB > Psychic bc most pex are spdef now)
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Ice Punch:
252 Atk Jirachi Ice Punch vs. 0 HP / 68 Def Landorus-Therian: 276-328 (86.5 - 102.8%) -- 93.8% chance to OHKO after Stealth Rock (18.8 without)
252 Atk Jirachi Ice Punch vs. 252 HP / 112+ Def Landorus-Therian: 244-288 (63.8 - 75.3%) -- guaranteed 2HKO after Leftovers recovery
+1 252 Atk Jirachi Ice Punch vs. 244 HP / 52 Def Gliscor: 324-384 (92 - 109%) -- guaranteed OHKO after Stealth Rock (56.3 without)
+1 252 Atk Jirachi Ice Punch vs. 252 HP / 4 Def Garchomp: 428-504 (101.9 - 120%) -- guaranteed OHKO
+1 252 Atk Jirachi Ice Punch vs. 0 HP / 4 Def Garchomp-Mega: 360-428 (100.8 - 119.8%) -- guaranteed OHKO
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Drain Punch:
+1 252 Atk Jirachi Drain Punch vs. 0 HP / 4 Def Heatran: 194-230 (60 - 71.2%) -- guaranteed 2HKO (z-magma can ohko even through the +1 spdef, non-z does 70-83 + trapping damage)
doesn't really help against anything else lol