Walkthrough

1. For completing this request, you can get Pokemetal Fragment Area as a reward.
2. Sparkling Skylands Completion Guide
3. If you don't have quick access to the kitchen, you can simply pick up the hamburger steak nearby, located behind a moss tile. Eat this to power up your Rock Smash and break the Pokemetal fragments.
4. How to Cook Simple Hamburger Steak
5. Cooking Guide: List of All Food Recipes
6. Follow Gardevoir to the empty building ahead. She will point out a large hole in the floor and ask you to investigate what lies beyond it.
7. Continue exploring the area until you find the Pokemetal Fragment blocks. Gardevoir will then ask you to break them and show her the fragments you obtain. | | To do this, you’ll need a powered-up Rock Smash. Eat a hamburger steak to gain enough strength to break the blocks.
8. Once you have a Pokemetal Fragment, show it to Gardevoir to complete the request. You can also smelt these fragments in a furnace to create Pokemetals.

Walkthrough source: Game8.