>>23192056252 Atk Life Orb Mega Rayquaza Dragon Ascent vs. 0 HP / 252 Def Togekiss: 266-316 (85.5 - 101.6%) -- 12.5% chance to OHKO
252 SpA Togekiss Dazzling Gleam vs. 0 HP / 0 SpD Mega Rayquaza: 248-294 (70.6 - 83.7%) -- guaranteed 2HKO
Dragon Ascent 2stronk. You maybe pull it off some of the time but only if you switch into EQ, M-Ray hasn't boosted with SD, and you luck out on your 12% chance. It also really sucks against pretty much anything else so it hardly justifies a teamslot.