Map 1 - Great Ball
The Decorative Great Ball sits behind the building west of the Pokémon Center. Work your way around to the water wheel, then break through the wall on its eastern side to open up the room.
Treasure Maps
Six maps hide in the Bubbly Basin, each pointing at a buried decorative Poké Ball.
Map 2 - Heal Ball
Head east of the main area and look for the pagoda whose windmill breaks the surface of the water. That is your marker. Follow the path west from it and dig down to reach the room holding the Decorative Heal Ball.
Map 3 - Dive Ball
This one is beside the old Cerulean City gym, just off the main area. The cluster of Star-spotted rocks next to the gym hides the way in. Smash through them for the room with the Decorative Dive Ball.
Map 4 - Net Ball
Return to the cave in the north where Frillish first appeared in the story and follow it through to the mines. From the giant crystal, head east and break the rock to reach the Decorative Net Ball.
Map 5 - Lure Ball
Bill’s House, the only one with a green roof, marks the north of the area. Go west from it to the lone patch of tall grass against the cliffs and dig straight down to the Decorative Lure Ball.
Map 6 - Quick Ball
From the gate you arrived through, head north into the main area and then left along the ruined building. The wall there is studded with Star-spotted rocks; smash them and follow the path to the Decorative Quick Ball.
