Mawile locations — where to catch

In Lumiose City (Legends: Z-A)

• Bleu Sector 8 — Walk
• Jaune Sector 2 — Walk
• Magenta Sector 6 — Static Encounter
• Magenta Sector 9 — Walk
• Rouge Sector 3 — Walk
• Vert Sector 9 — Walk
• Wild Zone 17 — Walk, Static Encounter
• Wild Zone 9 — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Iron Island — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Route 9 — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Cave of Origin — Walk
• Granite Cave — Walk
• Sky Pillar — Walk
• Victory Road — Walk

Other games (7)

• Sword / Shield (Gen 8): Bridge Field, Dusty Bowl, Giant's Seat, Hammerlocke Hills, Lake of Outrage, Rolling Fields, Stony Wilderness
• Ultra Sun / Ultra Moon (Gen 7): Ten Carat Hill
• Omega Ruby / Alpha Sapphire (Gen 6): Cave of Origin, Granite Cave, Victory Road, Sky Pillar
• X / Y (Gen 6): Friend Safari, Glittering Cave
• Black 2 / White 2 (Gen 5): Nimbasa City
• Black / White (Gen 5): Challengers Cave
• XD (Gen 3): Onbs

Mawile — full Pokédex entry