Walkthrough

1. For completing this request, you can get Concrete Mixer as a reward.
2. Be sure to complete Make Concrete to learn how to make concrete, as this is required for the Rebuild the Pokemon Center request in Sparkling Skylands.
3. Rebuild the Pokemon Center Walkthrough
4. Head to the tower at the top of the next island to meet Tinkmaster.
5. Tinkmaster will ask you to rebuild the lift platform, starting by making concrete. First, befriend a Pokémon with the Crush ability.
6. Tinkmaster will suggest Conkeldurr, so build its construction site generator with the materials you can find just below the waterfall.
7. Craft a concrete mixer using two iron ingots.
8. Place the concrete mixer anywhere near or directly on top of the water.
9. Add limestone and bring a Pokémon with the Crush ability to start the process. Limestone is abundant on the next island where Tinkmaster is, so just use Rock Smash to get those blocks.
10. Gather six of the completed concrete to complete the quest.

Walkthrough source: Game8.