Luxio locations — where to catch

In Paldea (Scarlet & Violet)

• South Province (Area Five) — Walk
• South Province (Area Three) — Walk

In Kitakami (Scarlet & Violet – The Teal Mask)

• Kitakami Wilds — Walk
• Paradise Barrens — Walk
• Timeless Woods — Walk

In Hisui (Legends: Arceus)

• Cloudcap Pass — Walk
• Floaro Gardens — Walk
• Heavenward Lookout — Walk
• Lake Verity — Walk
• Oreburrow Tunnel — Walk
• Sacred Plaza — Walk
• Sandgem Flats — Walk
• Sonorous Path — Walk
• Space-time distortions — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Fuego Ironworks — Walk
• Route 222 — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk

Other games (5)

• Brilliant Diamond / Shining Pearl (Gen 8): Fuego Ironworks
• Sword / Shield — The Isle of Armor (Gen 8): Fields of Honor, Loop Lagoon, Soothing Wetlands, Training Lowlands
• Sun / Moon (Gen 7): Alola Route 8
• Omega Ruby / Alpha Sapphire (Gen 6): Route 118
• X / Y (Gen 6): Friend Safari

Luxio — full Pokédex entry