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Did some quick calculations, using the Showdown damage calculator and editing Mega Gardevoir's Attack stat. That meant that STAB and Pixilate were factored in.
>100 base Attack
252+ Atk Pixilate Mega Gardevoir Return vs. 252 HP / 252+ Def Rotom-W: 136-162 (44.7 - 53.2%) -- 0.4% chance to 2HKO after Leftovers recovery
>100 base Attack plus DD
+1 252+ Atk Pixilate Mega Gardevoir Return vs. 252 HP / 252+ Def Rotom-W: 204-241 (67.1 - 79.2%) -- guaranteed 2HKO after Leftovers recovery
For contrast, even simply base 100 (+30) is stronger than, say:
252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 252 HP / 252+ Def Rotom-W: 130-154 (42.7 - 50.6%) -- guaranteed 3HKO after Leftovers recovery
252+ Atk Life Orb Bisharp Sucker Punch vs. 252 HP / 252+ Def Rotom-W: 125-148 (41.1 - 48.6%) -- guaranteed 3HKO after Leftovers recovery
After a Dragon Dance it becomes more powerful than another premier Physical Fairy
252+ Atk Choice Band Huge Power Azumarill Play Rough vs. 252 HP / 252+ Def Rotom-W: 184-217 (60.5 - 71.3%) -- guaranteed 2HKO after Leftovers recovery
For a no-drawbacks move, that's pretty respectable. Bulk, typing, and Roost will probably afford many boost opportnities. I'm personally expecting 105-110 Offenses, but hey, you never know.
