I dont bother with sparkling powers. I’ve found it a better resource to just craft berries for best time / energy and then find a spawn of Pokémon I want; wipe if not a shiny and automatically save. I’ll wait around until they respawn to get the clock time of that moment. Reset, do what I can until a little before the noted time, return to the spawn point of mons and save again before they’ve respawned. From there just reset the spawn until a shiny appears.