Now this is a bit of noteworthy information, especially how it evolves. Though first a correction: ALL forms of Lycanroc can learn this Z-Move, not just Dusk (it's why Stone Edge is the move Lycanroc needs to learn as all Lycanroc can learn Stone Edge, otherwise why wouldn't it use Accelerock).
Radial Edge Storm: With it using Stone Edge probably have a Power of 200+, though it's that effect which is interesting: clearing field effects. The example given is the Terrain moves, so it's sort of like a counter to the Island Guardians than? Wonder if entry hazards are also considered field effects, if they are that would be pretty significant. Could really carve a niche for Lycanroc... okay, probably for Midday and Dusk (sorry Midnight).
With these new Z-Moves getting game changing effects I wonder if they'll give the older signature Z-moves a buff too.
Dusk Evolving: So, Rockruff needs the Ability Own Tempo to evolve into Dusk. Rockruff normally doesn't have Own Tempo, thus why we need the Event Rockruff. In addition we only have a short time window each day to evolve into Dusk, meaning I guess we can evolve it into its other forms if we want (curious if those form will get a unique Ability if this is true, though if its Own Tempo obviously not worth it; or probably just become their Hidden Ability). Alright, so with this news MAYBE it's not as Event exclusive as we thought? "But only way to get it Own Temp Rockruff is by Event". True, but at least it's not a special flag we can't see, it's something visibly different meaning in the future if they want to make Dusk available all they'd just need to do is give out more Own Tempo Rockruff or, in future games, have it as a second Hidden Ability (or even change its Hidden Ability, I don't think anyone will miss Steadfast). Also, does this mean Dusk's Ability is also Own Tempo? Alright, not like Midday has any better Abilities, if there's anything Midnight can gloat about is having a pretty good Ability in No Guard... which is a Hidden Ability but hey it's something. EDIT: D'oh, forget it was revealed it got Tough Claws.