>>27465897It was a gift to AZ from his mother, according to an interview with GF, so we don't know where its origins are. It's also shown using Light of Ruin in AZ's backstory during the war, which confirms that's it's a natural move that it learns and not a byproduct of the weapon. Then there's the fact that AZ would never willingly part with his Floette to the protagonist.
All signs are pointing to yes for Eternal Floette being an Alola variant. Maybe we'll even get Flabebe-E and Florges-E now.