Walkthrough
At the end of Route 4 is Turrfield, where the first Pokemon Gym is found. However, upon arrival, Hop will suggest talking to Sonia in the western part of Turrfield. After learning a bit more of the history of The Galar Region from Sonia, you will be able to proceed to challenging your very first Pokemon Gym.
Special Overworld:
Crawdaunt: Level 50
Items
X Attacks: Near Stone Pillars
Leaf Stone: Hidden In Far West
Revives: From Sonia
Everstone: Hidden In Southeastern Area From Gym
TM97: East Of Pokemon Gym
Energy Root: Near Bush By Pokemon Center
Max Revive: West Of Flower Shop
TM11: On Small Island Down River
Expert Belt: Interact With The Pillars Grass, Water, and Fire In That Order
Pokemon Center PokeMart Items (Through Storyline Progression)
Poke Ball, Great Ball, Ultra Ball
Potion, Super Potion, Hyper Potion, Max Potion, Full Restore
Antidote, Burn Heal, Ice Heal, Awakening, Paralyze Heal, Full Heal, Revive
Escape Rope, Repel, Super Repel, Max Repel, Poke Doll