Max Raid Battle: Axew's Eye (Only in Shield), Dappled Grove (Only in Shield), Dusty Bowl (Only in Shield) + 12 more
Walk: Rolling Fields (20%, Intense sun, Before the Hall of Fame, After the Hall of Fame, Only in Shield), Dusty Bowl (Only in Sword), Hammerlocke Hills (Only in Sword)
Overworld: Galar Route 3 (Only in Shield), Rolling Fields (Intense sun, Before the Hall of Fame, After the Hall of Fame, Only in Shield)
Growlithe in every game · Pokémon Sword & Shield interactive map (Galar)