Seaking locations — where to catch

In Sinnoh (Diamond, Pearl & Platinum)

• Celestic Town — Super Rod
• Lake Acuity — Super Rod, Good Rod
• Lake Valor — Super Rod, Good Rod
• Lake Verity — Super Rod, Good Rod
• Resort Area — Super Rod
• Route 203 — Super Rod
• Route 204 — Super Rod
• Route 208 — Super Rod
• Route 209 — Super Rod
• Route 212 — Super Rod
• Route 214 — Super Rod
• Route 229 — Super Rod
• Sendoff Spring — Super Rod
• Twinleaf Town — Super Rod

In Johto & Kanto (HeartGold & SoulSilver)

• Cerulean City — Super Rod, Surf
• Dark Cave — Super Rod
• Johto Safari Zone — Good Rod, Super Rod
• Mt. Mortar — Super Rod, Surf
• Mt. Silver — Good Rod, Super Rod, Surf
• Mt. Silver Cave — Super Rod
• Route 10 — Super Rod, Surf
• Route 24 — Super Rod, Surf
• Route 25 — Super Rod, Surf
• Route 4 — Super Rod, Surf
• Route 42 — Super Rod, Surf
• Route 9 — Super Rod, Surf
• Slowpoke Well — Super Rod
• Tohjo Falls — Super Rod, Surf
• Union Cave — Super Rod

In Hoenn (Ruby, Sapphire & Emerald)

• Safari Zone — Super Rod

In Kanto (FireRed & LeafGreen)

• Fuchsia City — Super Rod
• Safari Zone — Super Rod

In Sevii Islands (FireRed & LeafGreen)

• Berry Forest — Super Rod

In Johto & Kanto (Gold, Silver & Crystal)

• Cerulean City — Super Rod, Surf
• Dark Cave — Super Rod
• Mt. Mortar — Super Rod, Surf
• Mt. Silver — Super Rod, Surf
• Mt. Silver Cave — Super Rod
• Route 10 — Super Rod, Surf
• Route 24 — Super Rod, Surf
• Route 25 — Super Rod, Surf
• Route 4 — Super Rod, Surf
• Route 42 — Super Rod, Surf
• Route 9 — Super Rod, Surf
• Slowpoke Well — Super Rod
• Tohjo Falls — Super Rod, Surf
• Union Cave — Super Rod

In Kanto (Red, Blue & Yellow)

• Cerulean Cave — Super Rod
• Cerulean City — Super Rod
• Fuchsia City — Super Rod
• Route 23 — Super Rod
• Route 24 — Super Rod

Other games (10)

• Brilliant Diamond / Shining Pearl (Gen 8): Lake Acuity, Lake Valor, Lake Verity, Resort Area, Sendoff Spring, Route 203, Route 204, Route 209, Route 212, Route 214, Twinleaf Town
• Sword / Shield — The Isle of Armor (Gen 8): Max Lair
• Sword / Shield (Gen 8): Bridge Field, East Lake Axewell, Lake of Outrage, North Lake Miloch, South Lake Miloch, West Lake Axewell
• Let's Go, Pikachu! / Let's Go, Eevee! (Gen 7): Kanto Route 6
• Ultra Sun / Ultra Moon (Gen 7): Brooklet Hill, Malie Garden
• Sun / Moon (Gen 7): Brooklet Hill, Malie Garden
• Omega Ruby / Alpha Sapphire (Gen 6): Safari Zone
• X / Y (Gen 6): Kalos Route 22, Kalos Route 3, Parfum Palace
• Black 2 / White 2 (Gen 5): Abundant Shrine, Aspertia City, Pinwheel Forest, Striaton City, Unova Route 11, Route 11, Unova Route 14, Route 14, Unova Route 22, Route 22, Unova Route 3, Route 3
• Black / White (Gen 5): Abundant Shrine, Pinwheel Forest, Striaton City, Unova Route 11, Route 11, Unova Route 14, Route 14, Unova Route 3, Route 3

Seaking — full Pokédex entry