Where to catch Smeargle

In Blueberry Academy (Scarlet & Violet – The Indigo Disk)

• Canyon Biome — Walk
• Chargestone Cavern — Walk
• Coastal Biome — Walk
• Polar Biome — Walk
• Savanna Biome — Walk
• Torchlit Labyrinth — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Artisan Cave — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Ruins of Alph — Walk

Smeargle — full Pokédex entry