Diglett locations — where to catch

In Paldea (Scarlet & Violet)

• Alfornada Cavern — Walk
• East Province (Area Three) — Walk
• East Province (Area Two) — Walk
• Poco Path — Walk
• South Province (Area One) — Walk
• South Province (Area Six) — Walk
• South Province (Area Two) — Walk, Static Encounter
• Tagtree Thicket — Walk
• West Province (Area One) — Walk
• West Province (Area Two) — Walk

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

• Coastal Biome — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 228 — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Diglett's Cave — Walk
• Johto Safari Zone — Walk
• Route 48 — Walk
• Vermilion City — Rock Smash

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

Other games (6)

• Brilliant Diamond / Shining Pearl (Gen 8): Route 228
• Sword / Shield (Gen 8): Bridge Field, Galar Mine, Galar Route 4, Giant's Mirror, Rolling Fields
• Let's Go, Pikachu! / Let's Go, Eevee! (Gen 7): Digletts Cave, Lavender Town
• Ultra Sun / Ultra Moon (Gen 7): Route 5, Route 7, Diglett’s Tunnel, Verdant Cavern
• Sun / Moon (Gen 7): Route 5, Route 7, Diglett’s Tunnel, Lush Jungle, Seaward Cave, Ten Carat Hill, Verdant Cavern
• Omega Ruby / Alpha Sapphire (Gen 6): Fiery Path

Diglett — full Pokédex entry