Lampent locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 17 — Walk

In Kitakami (Scarlet & Violet – The Teal Mask)

• Oni Mountain — Static Encounter
• Timeless Woods — Walk

Other games (3)

• Sword / Shield — The Isle of Armor (Gen 8): Ballimere Lake, Giant's Bed, Max Lair, Old Cemetery, Snowslide Slope
• Sword / Shield (Gen 8): Dusty Bowl, Giant's Cap, Hammerlocke Hills, Lake of Outrage, Stony Wilderness
• X / Y (Gen 6): Friend Safari

Lampent — full Pokédex entry