Oran Berry (x5) - From the route start, look for gate to the south. Head through the reach the Berry Field. A nice man will give you these upon entering.
Pecha Berry (x5) - Given by the same man.
Sprinklotad - Also given by the same man.
Miracle Seed - Found in the southwest corner of the same field.
X Spec. Def. - Just past the day care is a series of yellow and purple flowers. This lies among them.
PP Up - Just before the stairs past the Battle Chateau. You'll see it by some flowers.
Silver Powder - Head up the stairs near the Connecting Cave entrance to find a prickly tree. Use Cut to clear the path and follow it to this item.
Persim Berry - In the southwest corner of the Connecting Cave entrances is a Persim Berry tree.
Tiny Mushroom - Lying by the same tree.
Route 8 (Cliffs)
HP Up - From the Connecting Cave exit, follow the ledges down the left side of the cliff to spot this.
Water Stone - A little further south is a large boulder. Use Strength to push it out of the way. The narrow ledge beyond holds this item.
Leaf Stone - Just a bit further down the mountain is a set of stepping stones you can hop across. Use them to reach an otherwise unreachable ledge to grab this.
Heart Scale - You can only reach this from a tiny path to the right of the Pokémon Center in Ambrette Town.
TM94: Rock Smash - Speak to the girl near the Aquarium to receive this.
TM96: Nature Power - Head into the Hotel Ambrette and speak to the girl on the right side of the lobby to receive this.
Sp. Def. Power Lv. 1 (O-Power) - Head to the far right room of the second floor of the Hotel Ambrette to find Mr. Bonding again. He'll give you another O-Power if you speak to him.
Old Rod - Head inside the Ambrette Aquarium and descend to the lower level. Speak to the fisherman in the hat to receive this.
Rocky Helmet - Before exiting to Route 9, speak to the lady in the black tank top to receive this.
Pearl - After descending to Route 8 (Beach), follow the sand to the left- it wraps around back into the town. Follow the path to spot this.
X Defense - You'll spot this on the side of the rocky trail while riding Rhyhorn.
Paralyze Heal - Just a bit further down the trail on the right side.
Fire Stone - At the foot of the stairs near the Paralyze Heal is a narrow path. Follow it to find this handy item.
Dusk Ball - Just past the Glittering Cave entrance is another set of stairs. Head up them and look south to spot this.