Smeargle locations — where to catch

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

• Canyon Biome — Walk
• Coastal Biome — Walk
• Polar Biome — Walk
• Savanna Biome — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 208 — Walk
• Route 212 — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk
• Ruins of Alph — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Artisan Cave — Walk

In Sevii Islands (FireRed & LeafGreen)

• Altering Cave — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Ruins of Alph — Walk

Other games (6)

• Brilliant Diamond / Shining Pearl (Gen 8): Route 212
• Ultra Sun / Ultra Moon (Gen 7): Alola Route 2
• Sun / Moon (Gen 7): Alola Route 2
• X / Y (Gen 6): Friend Safari, Kalos Route 7
• Black / White (Gen 5): Route 5
• Colosseum (Gen 3): Snagem Hideout

Smeargle — full Pokédex entry