Tentacruel locations — where to catch

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

• Coastal Biome — Walk

In Hisui (Legends: Arceus)

• Islespy Shore — Walk
• Lunkers Lair — Walk
• Seagrass Haven — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Canalave City — Surf
• Fuego Ironworks — Surf
• Iron Island — Surf
• Pastoria City — Surf
• Pokémon League — Surf
• Route 205 — Surf
• Route 212 — Surf
• Route 213 — Surf
• Route 218 — Surf
• Route 219 — Surf
• Route 221 — Surf
• Route 222 — Surf
• Route 224 — Surf
• Sea Route 220 — Surf
• Sea Route 223 — Surf
• Sea Route 226 — Surf
• Sea Route 230 — Surf
• Sunyshore City — Surf
• Valley Windworks — Surf

In Johto & Kanto (HeartGold & SoulSilver)

• Cherrygrove City — Surf
• Cianwood City — Surf
• Cinnabar Island — Super Rod, Surf
• New Bark Town — Super Rod, Surf
• Olivine City — Surf
• Pallet Town — Super Rod, Surf
• Route 12 — Surf
• Route 13 — Surf
• Route 26 — Super Rod, Surf
• Route 27 — Super Rod, Surf
• Route 32 — Surf
• Route 34 — Surf
• Route 47 — Super Rod
• Sea Route 19 — Surf
• Sea Route 20 — Super Rod, Surf
• Sea Route 21 — Super Rod, Surf
• Sea Route 40 — Surf
• Sea Route 41 — Super Rod, Surf
• Union Cave — Surf
• Vermilion City — Super Rod, Surf
• Whirl Islands — Surf

In Hoenn (Ruby, Sapphire & Emerald)

• Abandoned Ship — Super Rod, Surf

In Sevii Islands (FireRed & LeafGreen)

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

In Johto & Kanto (Gold, Silver & Crystal)

• Cherrygrove City — Surf
• Cianwood City — Surf
• Cinnabar Island — Super Rod, Surf
• New Bark Town — Super Rod, Surf
• Olivine City — Super Rod, Surf
• Pallet Town — Super Rod, Surf
• Route 12 — Surf
• Route 13 — Surf
• Route 26 — Super Rod, Surf
• Route 27 — Super Rod, Surf
• Route 32 — Surf
• Route 34 — Surf
• Sea Route 19 — Surf
• Sea Route 20 — Super Rod, Surf
• Sea Route 21 — Super Rod, Surf
• Sea Route 40 — Surf
• Sea Route 41 — Super Rod, Surf
• Union Cave — Surf
• Vermilion City — Super Rod, Surf
• Whirl Islands — Surf

In Kanto (Red, Blue & Yellow)

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

Other games (6)

• Brilliant Diamond / Shining Pearl (Gen 8): Canalave City, Fuego Ironworks, Iron Island, Pastoria City, Pokémon League, Route 205, Route 213, Route 218, Route 219, Route 221, Route 222, Route 224, Sea Route 220, Sea Route 223, Sea Route 226, Sea Route 230, Sunyshore City, Valley Windworks
• Sword / Shield — The Isle of Armor (Gen 8): Challenge Beach, Courageous Cavern, Fields of Honor, Forest of Focus, Honeycalm Island, Honeycalm Sea, Insular Sea, Loop Lagoon, Max Lair, Soothing Wetlands, Stepping-Stone Sea, Workout Sea
• Let's Go, Pikachu! / Let's Go, Eevee! (Gen 7): Kanto Route 10, Kanto Route 11, Kanto Route 12, Kanto Route 13, Kanto Route 18, Kanto Route 24, Kanto Route 4, Kanto Sea Route 19, Kanto Sea Route 20, Kanto Sea Route 21, Seafoam Islands
• Ultra Sun / Ultra Moon (Gen 7): Alola Route 14, Alola Route 15, Ancient Poni Path, Poni Breaker Coast
• Sun / Moon (Gen 7): Poni Wilds
• Omega Ruby / Alpha Sapphire (Gen 6): Battle Resort, Ever Grande City, Route 124, Route 125, Route 126, Route 127, Route 128, Route 129, Route 130, Route 131, Route 132, Route 133, Victory Road, Mossdeep City, Pacifidlog Town, Seafloor Cavern, Shoal Cave

Tentacruel — full Pokédex entry