Masquerain locations — where to catch

In Paldea (Scarlet & Violet)

• South Province (Area Five) — Walk
• South Province (Area Four) — Walk
• South Province (Area One) — Walk

In Kitakami (Scarlet & Violet – The Teal Mask)

• Kitakami Wilds — Walk
• Mossfell Confluence — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 229 — Surf

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Surf

Other games (5)

• Ultra Sun / Ultra Moon (Gen 7): Malie Garden
• Sun / Moon (Gen 7): Malie Garden
• Omega Ruby / Alpha Sapphire (Gen 6): Route 102, Route 111, Route 114, Route 117, Route 120, Route 123, Petalburg City
• X / Y (Gen 6): Friend Safari, Kalos Route 3
• Black 2 / White 2 (Gen 5): Route 11

Masquerain — full Pokédex entry