Zinc

Next to a rock.

On the rooftops.

Next to a small rock.

Near edge of high ground.

Near a rock.

Bottom of pit.

Near cliff side.

High up.

Near edge of high ground.

On the large rockface near the Flareon tera.
Note: Items will respawn after the first instance within a random pool of items.

Next to a little rock near the Trainer.

On the southeastern edge of the larger island in West Paldean Sea.

Inside Chargestone Cavern, upper level.