Treasure Maps are a key collectible within the Bubbly Basin DLC for Pokémon Pokopia. These maps, categorized as Human Records, lead players to hidden decorative Poké Balls. While finding the maps themselves is not strictly necessary to obtain the rewards, locating them can aid in the collection of all items needed to encounter every new Pokémon introduced in the Bubbly Basin area. Players can find Treasure Maps by smashing glowing blocks that appear randomly in Bubbly Basin daily.
Treasure Map 1 Location
To find the first Treasure Map's reward, head to the Pokémon Center in Bubbly Basin. Go past the building adjacent to the Pokémon Center and descend the stairs. Destroy the Blue Rocks located next to a bench to reveal a hidden room containing the Decorative Great Ball.
Treasure Map 2 Location
This map's treasure is found beyond the area where the Ocean Temple is constructed during the 'Build the beautiful building' Important Request. Approach the road near a ruined red tower. Destroy the Beach Sand blocks situated on the edge of the blue tile road, opposite the red tower and to the right of a nearby ruined house. Dropping into the revealed hidden room will yield the Decorative Heal Ball.
Treasure Map 3 Location
Players seeking the third Treasure Map's reward should go to the entrance square of Bubbly Basin, near the metal blocks. Instead of entering the ruined Cerulean City Gym, focus on the area with the metal blocks. From this spot, look towards the right to find the remnants of a stone wall embedded in a Blue Rock cliffside. Destroy the Blue Rocks situated above the overlapping sections of the stone wall. A Pokémon with Search Speciality can assist in locating the exact spot. Swimming into the revealed hidden room will grant the Decorative Dive Ball.
Treasure Map 4 Location
The fourth Treasure Map leads to the Bubbly Basin mines, the same location where the Starmie Doll was found during the 'Build the beautiful building' Important Request. The most accessible entrance to these mines is near the ruined garden and to the right of the ruined bridge in Bubbly Basin. Navigate through the caves until you reach an area with three blue crystal formations and rail tracks. A cluster of Blue Rocks between two large blue crystals conceals the secret room containing the Decorative Net Ball.
Treasure Map 5 Location
To find the reward for Treasure Map 5, travel to Bill's House. This location can be reached by crossing the bridge in Bubbly Basin, proceeding through the children's park, and following the path to the right until a house with a Portal Pod is visible. Near this ruined house, a lamppost stands by a cliff wall. Position yourself to the right of the lamppost and move forward. Jump up the first layer of blocks and stop before the second. Destroy the top layer of blocks, specifically the first four directly in front of you, to access the secret room containing the Decorative Lure Ball.
Treasure Map 6 Location
The final Treasure Map's reward is found near the stairs leading to the Bubbly Basin Area Gate. To the left of the bottom of these stairs, a ruined house is visible. In a corner near this house, a collection of Star-spotted Rocks can be found. Smashing these rocks will uncover the secret room, inside which lies the Decorative Quick Ball.
After collecting all six decorative Poké Balls, players can use them to decorate the Bubbly Basin habitat. The Treasure Maps themselves are obtained by destroying the glowing blocks that randomly appear in Bubbly Basin each day. The appearance of a Treasure Map, similar to other items found this way, is randomized, requiring persistent block smashing to collect all six.