Azurill locations — where to catch

In Paldea (Scarlet & Violet)

• Poco Path — Walk
• South Province (Area Five) — Walk
• South Province (Area Four) — Walk
• South Province (Area One) — Walk
• South Province (Area Three) — Walk
• South Province (Area Two) — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Great Marsh — Walk
• Trophy Garden — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk

Other games (5)

• Brilliant Diamond / Shining Pearl (Gen 8): Great Marsh, Trophy Garden
• Sword / Shield — The Isle of Armor (Gen 8): Brawlers' Cave, Fields of Honor
• X / Y (Gen 6): Kalos Route 22, Kalos Route 3
• Black 2 / White 2 (Gen 5): Floccesy Ranch, Unova Route 20
• Black / White (Gen 5): White Forest

Azurill — full Pokédex entry