Treasure Map #4 in Pokemon Pokopia points to a hidden Poké Ball tucked inside a sealed room deep in Bubbly Basin. The route runs through a stone tunnel, down a ladder, and along a stretch of underwater railroad track before ending at a blue block wall that only a Rock Smash user can break open.
Quick answer: From Bubbly Basin, dive through the underwater cave, follow the railroad tracks past the blue crystals, then transform into Graveler and use Rock Smash on the breakable blue block wall near the underwater building to reveal the treasure room.
What you need before starting
The dig spot on the map is blocked by a wall, so a Pokémon that knows Rock Smash is mandatory. Graveler is the reliable pick for this, since transforming into it lets you shatter the blue block barrier standing between you and the Poké Ball.
Note: The in-game hint suggests bringing a Pokémon with the Search specialty to help pinpoint marked spots. That helper is optional here because the wall’s location is fixed, but the Rock Smash user is not.
| Requirement | Detail |
|---|---|
| Starting area | Bubbly Basin |
| Ability needed | Rock Smash (Graveler) |
| Traversal | Swimming and diving through underwater passages |
| Objective | Break the blue block wall and claim the treasure Poké Ball |
Route to the Treasure Map 4 location
How to confirm you found it
You know the run worked once the wall breaks and the sealed room opens, letting you walk inside and collect the treasure Poké Ball. If the wall will not break, you are not using a Rock Smash user, so switch to Graveler before trying again. If you never reach the marked spot, retrace the underwater railroad tracks and keep following them until you pass the blue crystals and reach the underwater building where the wall is set.
