Now, the only Move I would ever have that is not part of a Pokemon's NATURAL move set for a story is Dusk Form Lycanroc with Quick Guard.

In EotBC, Lycanroc/The Seraph knows this move, and was taught it by a Meowstic move tutor. I can see it more being used to keep the plot moving against bosses that Poochy might be unde-rleveled for. (Poochy being the Lv. 1 that she is, Lycanroc being an experienced explorer and likely about 30 Lv ahead of her. but He wouldn't use it in normal situations, just when things are legitimately dangerous.)
-I figured also that this would be a good move for a dusk form to learn as Midday learns it naturally, so its not too far off for a dusk to learn it.-
He uses it to protect his entire team, especially Poochyena.
Now, I've NEVER played Gates to Infinity OR Super, so Ive never played a game with this in it. I would expect that it would do similarly though to how it performs in the main series.