Krabby locations — where to catch

In Sinnoh (Diamond, Pearl & Platinum)

• Sea Route 226 — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Cherrygrove City — Good Rod, Old Rod, Super Rod
• Cianwood City — Good Rod, Old Rod, Rock Smash, Super Rod
• Cliff Cave — Rock Smash, Walk
• Johto Safari Zone — Good Rod, Old Rod, Walk
• Olivine City — Good Rod, Old Rod, Super Rod
• Route 34 — Good Rod, Old Rod, Super Rod
• Route 47 — Rock Smash, Walk
• Sea Route 19 — Good Rod, Old Rod, Rock Smash, Super Rod
• Sea Route 40 — Good Rod, Old Rod, Super Rod
• Seafoam Islands — Good Rod, Old Rod
• Union Cave — Good Rod, Old Rod, Super Rod
• Whirl Islands — Good Rod, Old Rod, Super Rod, Walk

In Kanto (FireRed & LeafGreen)

• Cerulean City — Good Rod, Super Rod
• Cinnabar Island — Good Rod, Super Rod
• Pallet Town — Good Rod, Super Rod
• Route 10 — Good Rod, Super Rod
• Route 11 — Good Rod, Super Rod
• Route 12 — Good Rod, Super Rod
• Route 13 — Good Rod, Super Rod
• Route 24 — Good Rod, Super Rod
• Route 4 — Good Rod, Super Rod
• S.S. Anne — Good Rod, Super Rod
• Sea Route 19 — Good Rod, Super Rod
• Sea Route 20 — Good Rod, Super Rod
• Sea Route 21 — Good Rod, Super Rod
• Seafoam Islands — Good Rod, Super Rod, Surf
• Vermilion City — Good Rod, Super Rod

In Sevii Islands (FireRed & LeafGreen)

• Bond Bridge — Good Rod, Super Rod
• Five Island — Good Rod, Super Rod
• Five Isle Meadow — Good Rod, Super Rod
• Green Path — Good Rod, Super Rod
• Icefall Cave — Good Rod, Super Rod
• Kindle Road — Good Rod, Super Rod
• Memorial Pillar — Good Rod, Super Rod
• One Island — Good Rod, Super Rod
• Outcast Island — Good Rod, Super Rod
• Resort Gorgeous — Good Rod, Super Rod
• Tanoby Ruins — Good Rod, Super Rod
• Trainer Tower — Good Rod, Super Rod
• Treasure Beach — Good Rod, Super Rod
• Water Labyrinth — Good Rod, Super Rod
• Water Path — Good Rod, Super Rod

In Johto & Kanto (Gold, Silver & Crystal)

• Cerulean City — Old Rod
• Cherrygrove City — Good Rod, Old Rod, Super Rod
• Cianwood City — Good Rod, Old Rod, Rock Smash, Super Rod
• Dark Cave — Rock Smash
• Olivine City — Good Rod, Old Rod, Super Rod
• Route 34 — Good Rod, Old Rod, Super Rod
• Sea Route 19 — Good Rod, Old Rod, Super Rod
• Sea Route 40 — Good Rod, Old Rod, Rock Smash, Super Rod
• Union Cave — Good Rod, Old Rod, Super Rod
• Whirl Islands — Good Rod, Old Rod, Super Rod, Walk

In Kanto (Red, Blue & Yellow)

• Cerulean City — Super Rod
• Fuchsia City — Super Rod
• Route 10 — Super Rod
• Route 11 — Super Rod
• Route 12 — Super Rod
• Route 13 — Super Rod
• Route 17 — Super Rod
• Route 18 — Super Rod
• Route 24 — Super Rod
• Route 25 — Super Rod
• Route 6 — Super Rod
• Safari Zone — Super Rod
• Seafoam Islands — Walk, Super Rod
• Vermilion City — Super Rod

Other games (8)

• Brilliant Diamond / Shining Pearl (Gen 8): Sea Route 226
• Sword / Shield — The Isle of Armor (Gen 8): Challenge Beach, Fields of Honor, Insular Sea, Loop Lagoon
• Sword / Shield (Gen 8): Dusty Bowl, Giant's Cap, Giant's Mirror, North Lake Miloch, South Lake Miloch, West Lake Axewell
• Let's Go, Pikachu! / Let's Go, Eevee! (Gen 7): Kanto Route 10, Kanto Route 12, Kanto Route 13
• Omega Ruby / Alpha Sapphire (Gen 6): Route 105, Route 106, Route 107, Route 108, Route 109
• X / Y (Gen 6): Friend Safari
• Black 2 / White 2 (Gen 5): Virbank City, Virbank Complex
• Black / White (Gen 5): Driftveil City, Route 13, Unova Route 13, Route 4, Unova Route 4

Krabby — full Pokédex entry