So Ogerpon ties with Urshifu for the lowest BST for fully evolved Legendaries, which I find interesting since I thought it'd have a higher BST.
Also for reference.
252+ SpA Choice Specs Punk Rock Tera Normal Toxtricity Boomburst vs. 0 HP / 0 SpD Mew: 445-525 (130.4 - 153.9%) -- guaranteed OHKO
252+ SpA Choice Specs Tera Normal Chatot Boomburst vs. 0 HP / 0 SpD Mew: 396-468 (116.1 - 137.2%) -- guaranteed OHKO
252+ SpA Choice Specs Tera Normal Ursaluna-Blood Moon Boomburst vs. 0 HP / 0 SpD Mew: 516-608 (151.3 - 178.2%) -- guaranteed OHKO
So yeah not giving it Boomburst is definitely the right call.
Well the strongest Boomburst is from Chatot and Toxtricity, and neither have (marginally) better Scrappy.well not Just shitmons get boomburst but also... couldn't this move be just a bit more interesting it just has no flavour
Also for reference.
252+ SpA Choice Specs Punk Rock Tera Normal Toxtricity Boomburst vs. 0 HP / 0 SpD Mew: 445-525 (130.4 - 153.9%) -- guaranteed OHKO
252+ SpA Choice Specs Tera Normal Chatot Boomburst vs. 0 HP / 0 SpD Mew: 396-468 (116.1 - 137.2%) -- guaranteed OHKO
252+ SpA Choice Specs Tera Normal Ursaluna-Blood Moon Boomburst vs. 0 HP / 0 SpD Mew: 516-608 (151.3 - 178.2%) -- guaranteed OHKO
So yeah not giving it Boomburst is definitely the right call.