Actually, when I said that I was specifically referring to Jirachi and specially defensive Metagross. But now that I had a chance to run some damage calcs, well...
252+ SpA Choice Specs Adaptability (custom) Draco Meteor vs. 252 HP / 80 SpD Cresselia: 284-336 (63.96 - 75.67%)
252+ SpA Choice Specs Adaptability Dragalge Draco Meteor vs. 252 HP / 160 SpD Metagross: 176-208 (48.35 - 57.14%)
252+ SpA Choice Specs Adaptability Dragalge Draco Meteor vs. 252 HP / 0 SpD Jirachi: 191-225 (47.27 - 55.69%)
Not even a bulky resist is going to want to tank that. It's so powerful, here's a quick comparison:
252 SpA Choice Specs Latios Draco Meteor vs. 252 HP / 236+ SpD Jirachi: 116-137 (28.71 - 33.91%)
252+ SpA Choice Specs Adaptability Dragalge Draco Meteor vs. 252 HP / 236+ SpD Jirachi: 139-164 (34.4 - 40.59%)
Obviously Fairies would try to switch in, but that's a bit dangerous:
252+ SpA Choice Specs Adaptability Dragalge Sludge Wave vs. 248 HP / 216+ SpD Togekiss: 376-444 (100.8 - 119.03%) -- guaranteed OHKO
252+ SpA Choice Specs Adaptability Dragalge Sludge Wave vs. 252 HP / 252+ SpD Sylveon: 336-396 (85.27 - 100.5%) -- 81.25% chance to OHKO after Stealth Rock
252+ SpA Choice Specs Adaptability Dragalge Sludge Wave vs. 252 HP / 252+ SpD Florges: 296-352 (82.22 - 97.77%) -- 68.75% chance to OHKO after Stealth Rock
So yeah, just a tad dangerous. Even the most specially defensive Fairy is likely OHKO'd by the wrong prediction.
Oh, and one for the lol-factor (since we now have the first and only Pokemon to be 4x weak to Poison):
252+ SpA Choice Specs Adaptability (custom) Sludge Wave vs. 252 HP / 4 SpD Whimsicott: 1408-1664 (434.56 - 513.58%)
Dragalge = nuke.
Well you better carry Pink Blobs on a teams which aren't called Hyper Offense (so you can actually sacrifice your switches if needed) or ur in a lot of trouble. BTW Specially Defensive Jirachi with somewhat reliable recovery (Wish + Protect) should still be able to switch in more then once. Although if your opponent switches for example into Dugtrio, Gothilette or MegaGengar while you use Wish after Dragalge's Draco Meteor (I think you MUST use Wish after you switch after Draco Meteor or you won't be able to do it again) then ur screwed anyway. Or allow something else like Garchomp get his Swords Dance for free as you have only two options to do:
a) Switch out and let someone else take Wish. But it means you can't switch into Dragalge anymore unless you find some free turn to heal yourself on other Pokemon from opponents team.
b) Use Protect to heal yourself, but it's 100% free Swords Dance for Garchomp as an example here. It may be for example Quiver Dance Volcarona as well or SD Talonflame.
Well, the sheer amount of power Draco Meteor brings mean that you can actually buy free turns by just one, max two attacks (Draco Meteor + Sludge Wave) for your other Pokemon (like in an example I provided) if opponents switch-in doesn't have Pokemon which can handle it and have 1-turn reliable recovery. If your opponent uses Wish + Protect Pokemon to take Draco Meteor, you technically buy free turn for yourself or just need to sacrifice something.
And taking into account Dragalge good special bulk with GREAT resistances (Electric, Water, Grass, Fire, Poison, Fighting, etc.) with Toxic Spikes immunity means that finding that free turns to switch in should be easy as hell to do.
We probably look into one of the best wall-breakers in the game. Switching to this thing is a nightmare and unlike some other really powerful Specs users this one has pretty easy time finding those turns to switch-in and it's not hazards weak at all (Spikes are annoying, but that's it and we still have Defog/Rapid Spin/Magic Bounce to deal with those). I don't think it's broken, as it is slow as hell and easy to KO on physical side, but it looks like a top-tier threat once you provide it with good support (VoltTurn, etc.) although playing against it may be a real pain to deal with. Slower teams won't like this guy (and taking into account how suspectible to trapping things like Jirachi and Pink Blobs are) I would be really, really worried in a place of those teams.