Kingler locations — where to catch

In Johto & Kanto (HeartGold & SoulSilver)

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

In Kanto (FireRed & LeafGreen)

• Pallet Town — Super Rod
• Sea Route 19 — Super Rod
• Sea Route 20 — Super Rod
• Sea Route 21 — Super Rod

In Sevii Islands (FireRed & LeafGreen)

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

In Johto & Kanto (Gold, Silver & Crystal)

• Cerulean City — Super Rod
• Cherrygrove City — Super Rod
• Cianwood City — Super Rod
• Olivine City — Super Rod
• Route 34 — Super Rod
• Sea Route 19 — Super Rod
• Sea Route 40 — Super Rod
• Union Cave — Super Rod
• Whirl Islands — Super Rod

In Kanto (Red, Blue & Yellow)

• Cerulean Cave — Super Rod
• Route 10 — Super Rod
• Route 23 — Super Rod
• Route 25 — Super Rod
• Seafoam Islands — Walk, Super Rod

Other games (5)

• Sword / Shield — The Isle of Armor (Gen 8): Ballimere Lake, Challenge Beach, Fields of Honor, Frigid Sea, Giant's Bed, Giant's Foot, Insular Sea, Loop Lagoon, Max Lair, Training Lowlands
• Sword / Shield (Gen 8): Axew's Eye, Dusty Bowl, Galar Route 9, 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 12, Kanto Route 13
• Black 2 / White 2 (Gen 5): Hidden Grotto, Unova Route 18, Virbank City, Virbank Complex
• Black / White (Gen 5): Driftveil City, Unova Route 13, Route 13, Unova Route 4, Route 4

Kingler — full Pokédex entry