Slumbering Weald

Walkthrough
With Rose deciding to move forward prematurely to prevent the upcoming energy crisis, Leon will be forced to postpone your Championship Match against him in order to investigate what Rose is up to. In hopes of helping Leon, Hop will suggest going to the Slumbering Weald to find the Legendary Pokemon you did at the beginning of your journey. Once there, you will find Sonia is already there.

You and Hop will then travel deep into Slumbering Weald to find both Zacian and Zamazenta. When you do, Hop will ask that they help solve the problem that Rose has created. Unfortunately, they will disappear shortly after this, and then Sonia will arrive. She'll believe that you and Hop were just seeing things, before explaining her research and suggesting to go deeper into the woods to find the Rusted Sword and Rusted Shield. At the Shrine at the very end of the Slumbering Weald, you will find these items. And with them, you and Hop will travel back to Hammerlocke to assist Leon at the Energy Plant.

Wild Pokemon
Overworld - Early Forest:
Skwovet (40%): Levels 2-3
Rookidee (30%): Levels 2-3
Blipbug (30%): Levels 2-3
Grubbin (10%): Levels 2-3

Grasses - Early Forest:
Skwovet (50%): Levels 2-3
Rookidee (20%): Levels 2-3
Hoothoot (15%): Levels 2-3
Blipbug (10%): Levels 2-3
Grubbin (5%): Levels 2-3

Special Overworld - Early Forest:
Skwovet: Levels 2-3
Rookidee: Level 2

Overworld - Deep Forest:
Galarian Weezing (50%): Levels 45-47
Munna (30%): Levels 45-47
Orbeetle (15%): Levels 45-47
Corviknight (5%): Levels 45-47

Grasses - Deep Forest:
Galarian Weezing (30%): Levels 45-47
Munna (25%): Levels 45-47
Corviknight (20%): Levels 45-47
Orbeetle (15%): Levels 45-47
Butterfree (5%): Levels 45-47
Stunfisk (5%): Levels 45-47

Special Overworld - Deep Forest:
Stunfisk: Level 48

Fishing - Deep Forest:
Whiscash (60%): Levels 45-47
Barboach (20%): Levels 45-47
Magikarp (20%): Levels 45-47

Items (Early Forest):
Full Restore: Hidden In Last Grass Patch
Mental Herb: Western Path
Misty Seed: Northern Eastern Path
Life Orb: Southeastern Islet
Elixir: Hidden Near Northeastern Cliffside
Smoke Ball: North Of Eastern Log
TM86: Far North Cliffside