Walkthrough

1. For completing this request, you can get Smelting Furnace as a reward.
2. Follow Machoke to the mines northwest of the Pokemon Center. The path ahead will be blocked by fences and you'll have to destroy them to pass through.
3. Use Powered-Up Cut to destroy the fences and clear up the path. Make sure to eat Bread first to power up your Cut. Otherwise, you won't be able to destroy these fences with a regular Cut. | | You can then pick up these fences for decorations later on.
4. Once the path clears up, you can now access the mine. Up ahead is also the Smelting Furnace, which you can use to make glass and ingots.

Walkthrough source: Game8.