Dugtrio locations — where to catch

In Paldea (Scarlet & Violet)

• Alfornada Cavern — Walk
• Dalizapa Passage — Walk
• East Province (Area Three) — Walk
• East Province (Area Two) — Walk
• Glaseado Mountain — Walk
• Inlet Grotto — Walk
• North Province (Area One) — Walk
• North Province (Area Three) — Walk
• North Province (Area Two) — Walk
• South Province (Area Six) — Walk
• Tagtree Thicket — Walk
• West Province (Area Two) — Walk

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

• Coastal Biome — Walk
• Torchlit Labyrinth — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 228 — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Diglett's Cave — Walk

In Kanto (FireRed & LeafGreen)

• Diglett's Cave — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Diglett's Cave — Walk

In Kanto (Red, Blue & Yellow)

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

Other games (8)

• Brilliant Diamond / Shining Pearl (Gen 8): Route 228
• Sword / Shield — The Isle of Armor (Gen 8): Max Lair
• Sword / Shield (Gen 8): Bridge Field, Dusty Bowl, Galar Route 6, Giant's Cap, Giant's Mirror, Hammerlocke Hills, Lake of Outrage, Rolling Fields
• Let's Go, Pikachu! / Let's Go, Eevee! (Gen 7): Digletts Cave
• Ultra Sun / Ultra Moon (Gen 7): Haina Desert, Lush Jungle, Poni Coast, Resolution Cave, Vast Poni Canyon
• Sun / Moon (Gen 7): Haina Desert, Poni Coast, Resolution Cave, Vast Poni Canyon
• X / Y (Gen 6): Friend Safari, Kalos Route 13
• XD (Gen 3): Citadark Isle

Dugtrio — full Pokédex entry