Gardevoir locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 20 — Walk

In Paldea (Scarlet & Violet)

• Glaseado Mountain — Walk
• North Province (Area One) — Walk
• North Province (Area Three) — Walk

In Kitakami (Scarlet & Violet – The Teal Mask)

• Kitakami Wilds — Walk
• Timeless Woods — Walk

In Hisui (Legends: Arceus)

• Heart's Crag — Walk
• Lake Acuity — Walk

Other games (2)

• Sword / Shield — The Isle of Armor (Gen 8): Fields of Honor, Soothing Wetlands, Training Lowlands
• Sword / Shield (Gen 8): Bridge Field, Dusty Bowl, Hammerlocke Hills, Lake of Outrage, Motostoke Riverbank, Rolling Fields, Stony Wilderness, Watchtower Ruins

Gardevoir — full Pokédex entry