Turffield

Upon arriving from Route 4, speak with Hop near the Pokémon Center.

Enter the Pokémon Center to rest.

Exit and head east to the far end of the town. A League staff member blocks the path to Route 5.

Head left. At a small crossroad, go south-west and search the ground near stone slabs for a hidden Everstone.

Head north-west towards the stadium's side and grab TM97 Brutal Swing on the right.

Return to the Pokémon Center and head north from its left side. Gym Challengers block the stadium entrance.

Go left along the side road, past the flower shop, and head north towards the stadium's wall. Pick up the Max Revive on the floor.

Return to the Pokémon Center and head west.

Follow Yamper until it stops you before reaching Sonia. Turn right into a side path and grab the 3 X Attacks in front of a stone structure.

Turn left into another side path and search the bush below for a Leaf Stone.

Follow the path to the top to reunite with Sonia.

You will receive Milo’s League Card and 2 Revives.

Check the water bowls to the right and search the lowest one for Fresh Water.

Chat with the little girl by a stone slab. She will give you a riddle about elemental stone slabs.

To find the Grass slab, go back towards the town entrance, take the north path towards the stadium, turn left, and run past the flower shop. Check the big stone slab at the end of the path before descending to the stadium's wall.

To find the Water slab, head back to the town entrance, go along the west path, and near the hill top, take a left. Go up from where you found the Leaf Stone and check the stone slab next to the standing man.

To find the Fire slab, take the east path from the town entrance towards the guarded exit. Go up to the stone slab by the riverside and inspect it.

If the three slabs are inspected in the correct order (Grass, Water, Fire), you will find a secret Expert Belt.

Head to the stadium. Hop will be waiting outside.

Enter the stadium.