Rare Candy - West of the ruins is a bunch of tall grass. Use Cut to clear the tree to the upper section. In the northeast corner is an item.
Lum Berry - Follow the route as it winds south, and look for the Lum Berry tree just off to the east.
Max Potion - South of the Lum Berry tree is a bunch of tall grass. Wade through and kick away the leaf pile to reveal this.
TM97: Dark Pulse - After descending the first staircase, head north. Use Cut to clear the path, then use Waterfall to ascend the nearby waterfall. Follow the stream to reach a hidden area of Route 15. You'll find this on a ledge here.
Super Rod - Enter the Fishing Shack after the second staircase. Speak to the first fisherman to obtain this.
Dive Ball - In the northwest corner of the docks next to the Fishing Shack.
Fist Plate - Head south from the Fishing Shack. Use Strength to push the boulder out of the way and reach this.
Rare Candy - Examine the rock near the Fist Plate to obtain this.
Lost Hotel (Route 16 Entrance)
Dread Plate - Use Rock Smash to break through the left wall near the entrance and reveal this.
TM56: Fling - Head west until you see the roller skater. Talk to her to receive this.
Protector - In the northwest section are several cracked walls. Use Rock Smash to break through the one on the right to reach this.
TM12: Taunt - After battling Team Flare Aliana, head through the green teleporter. Defeat the Team Flare Grunt here, then take the arrow pad east, then south. Head west to find a room full of beds. Speak to the Team Flare Grunt in here to receive this.
Revive - Between beds in the same room.
Black Glasses - After battling Team Flare Celosia and Team Flare Bryony, exit the room. Step onto the arrow pad on the far left to go south. Follow this path without touching any pads and use the teleporter. These are just to the left of your arrival spot.
Rare Candy - Defeat the Team Flare Grunt just north of the Black Glasses and use the teleporter. Enter the room to the north to find this at the northern end of the chamber.
Hyper Potion - Teleport back to the previous Team Flare Grunt, then use the arrow pad pointing west. Step onto the arrow on the far right, then stop onto the teleporter when you stop moving. There's an item in this little section.
Hyper Potion - Head south when the route splits to hop and ledge and find this.
Wacan Berry - There's a tree just before the suspension bridge. Use Cut to clear the way, then follow the path to the Wacan Berry tree.
PP Up - Grind the rail next to the tree to reach this.
Max Ether - Found on a ledge near the upper east entrance to Terminus Cave.
X Defense - This lies near where Black Belt Yanis patrols under the train tracks, to the right of the lower Terminus Cave entrance. You'll need to use Rock Smash to get there.