252+ SpA Choice Specs Politoed Hydro Pump vs. 252 HP / 4 SpD Blissey in Rain: 267-315 (37.3 - 44.1%) -- 100% chance to 3HKO after Leftovers recoveryDoes anything have comparable turn one power to Mega Charizard Y? I want to try using Mega Charizard X on a team, but have grown to rely on Mega Char Y's wallbreaking utility.
252 SpA Choice Specs Latios Draco Meteor vs. 252 HP / 4 SpD Blissey: 246-289 (34.4 - 40.4%) -- 45.9% chance to 3HKO after Leftovers recovery
252 SpA Mega Charizard Y Fire Blast vs. 252 HP / 4 SpD Blissey in Sun: 241-285 (33.7 - 39.9%) -- 30.4% chance to 3HKO after Leftovers recovery
252+ SpA Choice Specs Exploud Boomburst vs. 252 HP / 4 SpD Blissey: 228-268 (31.9 - 37.5%) -- 0% chance to 3HKO after Leftovers recovery
252 SpA Choice Specs Adaptability Porygon-Z Tri Attack vs. 252 HP / 4 SpD Blissey: 208-246 (29.1 - 34.4%) -- 99.8% chance to 4HKO after Leftovers recovery
In terms of immediate power, that's about as good as it gets on the Special side in OU. Specs Latios is probably the most viable of those as hard hitters, though.