>>51499587>>51499687>>51499445>>51499885Okay, disregard all the Hatterene calcs. I didn't actually play SwSh, so I didn't realize Hatterene doesn't learn Moonblast and didn't think to double check. My bad.
HOWEVER. Diancie-Mega learns Moonblast and has a base SPA stat of 160. It's going to suffer from not having access to Specs, but you can actually use it after the second turn without getting killed because it has a SPE stat of 110 (85 points higher than Hatterene) and can outspeed everything except Hyperion w/Hellbone (although it resists all of his attacks) and Lord Hypnos (which Magic Bounce hard counters anyway). It also fulfills the ≥600 BST requirement so you don't get killed by Grim after you defeat him.
Here's the offensive damage calcs:
>252+ SpA Diancie-Mega Moonblast vs. 252 HP / 252 SpD Honchkrow: 462-546 (114.3 - 135.1%) -- guaranteed OHKO>252+ SpA Diancie-Mega Hidden Power Fighting vs. 252 HP / 252 SpD Bisharp: 336-396 (100.5 - 118.5%) -- guaranteed OHKO>252+ SpA Diancie-Mega Moonblast vs. 252 HP / 252 SpD Hydreigon: 676-796 (174.2 - 205.1%) -- guaranteed OHKO>252+ SpA Diancie-Mega Power Gem vs. 252 HP / 252 SpD Houndoom: 306-362 (86.4 - 102.2%) -- 18.8% chance to OHKO>252+ SpA Diancie-Mega Moonblast vs. 4 HP / 252 SpD Umbreon: 264-312 (79.5 - 93.9%) -- guaranteed 2HKO>252+ SpA Diancie-Mega Moonblast vs. 252 HP / 252 SpD Tyranitar: 314-372 (77.7 - 92%) -- guaranteed 2HKO>252+ SpA Diancie-Mega Moonblast vs. 252 HP / 252 SpD Tyranitar-Corrupted Mega: 278-330 (68.8 - 81.6%) -- guaranteed 2HKO>252+ SpA Diancie-Mega Moonblast vs. 252 HP / 252 SpD Darkrai-Sephiroth: 338-398 (67 - 78.9%) -- guaranteed 2HKO(1/?)