Where to catch Dugtrio

In Paldea (Scarlet & Violet)

• Alfornada Cavern — Walk
• Area Zero — Walk
• Asado Desert — Walk
• Dalizapa Passage — Walk
• East Province (Area Three) — Walk
• North Province (Area Three) — Walk
• North Province (Area Two) — Walk
• South Province (Area Six) — Walk
• South Province (Area Two) — Walk

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

• Coastal Biome — Walk
• Torchlit Labyrinth — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Diglett's Cave — Walk

In Kanto (Red, Blue & Yellow)

• Diglett's Cave — Walk
• Route 11 — NPC Trade, Walk

Dugtrio — full Pokédex entry