+ Stored Power
Stats and Typing: Coupled with Cosmic Power and Jirachi great typing and defenses, it would make an interesting sweeper set (Calm Mind works too)
Design: I don't totally understand what's exactly the pattern for getting this move (and even the japanese name doesn't help) but since Victini can use it, I don't see why Jirachi couldn't, I just see every mon that learn Cosmic Power being able to use this (should be that way IMO, Starmie would be cool too)
Need: This cute thing doesn't really need more sets, but it would be awesome anyway, it may not have Sygilyph's Magic Guard, but it's typing make it a good enough user of it.