If Jirachi is going to be meteor-themed, I'd expect to see Meteor Mash as well. It'll probably be something like Wish, Doom Desire, Meteor Mash, Draco Meteor. (Draco Meteor's Japanese name is "Meteoric Swarm", so doesn't really have anything to do with dragons anyway besides the type.)This is purely speculation but that "special attack" that Jirachi is using in the screenshot looks oddly similar to Draco Meteor... It also fits with Jirachi's "space" theme and the supposed name of the new area it unlocks: "Edge of the Night Sky".
Jirachi using "special attack".
Draco Meteor
The attack is being used against the Pokemon closest to us by the Jirachi on the far side.