Mantyke locations — where to catch

In Hisui (Legends: Arceus)

• Aipom Hill — Walk
• Bathers' Lagoon — Walk
• Castaway Shore — Walk
• Ginkgo Landing — Walk
• Tranquility Cove — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Sea Route 223 — Surf
• Sunyshore City — Surf

Other games (8)

• Brilliant Diamond / Shining Pearl (Gen 8): Sea Route 223, Sunyshore City
• Sword / Shield — The Isle of Armor (Gen 8): Fields of Honor, Honeycalm Island, Honeycalm Sea, Insular Sea, Stepping-Stone Sea, Workout Sea
• Sword / Shield (Gen 8): East Lake Axewell, Route 9, Galar Route 9, Giant's Mirror, Lake of Outrage, Motostoke Riverbank, North Lake Miloch, South Lake Miloch, West Lake Axewell
• Ultra Sun / Ultra Moon (Gen 7): Route 1, Route 8, Hauoli City, Kalae Bay, Melemele Sea
• Omega Ruby / Alpha Sapphire (Gen 6): Battle Resort
• X / Y (Gen 6): Azure Bay, Kalos Route 12, Shalour City
• Black 2 / White 2 (Gen 5): Undella Bay, Unova Route 21
• Black / White (Gen 5): Undella Bay, Undella Town

Mantyke — full Pokédex entry