252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 4 SpD Azelf: 283-334 (97.2 - 114.7%) -- 87.5% chance to OHKO (destroyed by Sucker Punch, though. Naive variants are clean KOs.)
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 4 SpD Darmanitan: 340-402 (96.8 - 114.5%) -- 81.3% chance to OHKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 4 SpD Starmie: 243-286 (93.1 - 109.5%) -- 56.3% chance to OHKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 16 HP / 0 SpD Mega Medicham: 244-288 (92 - 108.6%) -- 50% chance to OHKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Mamoswine: 322-379 (89.6 - 105.5%) -- 37.5% chance to OHKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Weavile: 244-288 (86.8 - 102.4%) -- 18.8% chance to OHKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Thundurus: 256-303 (85.9 - 101.6%) -- 12.5% chance to OHKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Mega Pidgeot: 255-301 (83 - 98%) -- guaranteed 2HKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Landorus-T: 255-301 (79.9 - 94.3%) -- guaranteed 2HKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Raikou: 213-252 (66.3 - 78.5%) -- guaranteed 2HKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Mega Gardevoir: 165-195 (59.5 - 70.3%) -- guaranteed 2HKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 0 HP / 0 SpD Mega Gyarados: 169-201 (51 - 60.7%) -- guaranteed 2HKO
252+ SpA Choice Specs Meloetta Tri Attack vs. 252 HP / 0 SpD Mega Gardevoir: 165-195 (48.5 - 57.3%) -- 93.4% chance to 2HKO
HP Fighting and Shadow Ball tend to annihilate their targets, but Meloetta has to worry about Bisharp and Tyranitar destroying it with Sucker Punch -- of course, you can potentially hit them with Memento to give something else a setup opportunity.
Overall, two things to take away from this:
- Basically anything on offense that makes the mistake of trying to set up on Meloetta is going to die.
- Run Stealth Rock.