Noctowl locations — where to catch

In Kitakami (Scarlet & Violet – The Teal Mask)

• Fellhorn Gorge — Walk
• Kitakami Wilds — Walk
• Mossfell Confluence — Walk
• Timeless Woods — Walk
• Wistful Fields — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Acuity Lakefront — Walk
• Great Marsh — Walk
• Lake Acuity — Walk
• Lake Valor — Walk
• Mt. Coronet — Walk
• Route 210 — Walk
• Route 211 — Walk
• Route 216 — Walk
• Route 217 — Walk
• Sendoff Spring — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Ilex Forest — Headbutt
• Route 13 — Walk
• Route 14 — Walk
• Route 15 — Walk
• Route 2 — Walk
• Route 43 — Walk
• Route 47 — Walk
• Route 8 — Walk
• Viridian Forest — Headbutt, Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Ilex Forest — Headbutt
• Route 11 — Walk
• Route 13 — Walk
• Route 14 — Walk
• Route 15 — Walk
• Route 2 — Walk
• Route 25 — Walk
• Route 26 — Walk
• Route 27 — Walk
• Route 37 — Walk
• Route 38 — Walk
• Route 39 — Walk
• Route 43 — Walk
• Route 5 — Walk
• Route 8 — Walk

Other games (8)

• Brilliant Diamond / Shining Pearl (Gen 8): Acuity Lakefront, Great Marsh, Lake Acuity, Lake Valor, Mt. Coronet, Sendoff Spring, Route 210, Route 211, Route 216, Route 217
• Sword / Shield — The Isle of Armor (Gen 8): Loop Lagoon, Max Lair
• Sword / Shield (Gen 8): Bridge Field, East Lake Axewell, Giant's Cap, Hammerlocke Hills, Motostoke Outskirts, Motostoke Riverbank, Rolling Fields
• Ultra Sun / Ultra Moon (Gen 7): Lush Jungle
• X / Y (Gen 6): Kalos Route 20, Pokemon Village
• Black 2 / White 2 (Gen 5): Nature Sanctuary
• Black / White (Gen 5): Abundant Shrine
• Colosseum (Gen 3): Pyrite Town

Noctowl — full Pokédex entry