Banette locations — where to catch

In Lumiose City (Legends: Z-A)

• Jaune Sector 9 — Static Encounter
• Wild Zone 15 — Walk, Static Encounter

In Paldea (Scarlet & Violet)

• Glaseado Mountain — Walk
• South Province (Area Six) — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 225 — Walk
• Route 227 — Walk
• Sea Route 226 — Walk
• Stark Mountain — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Sky Pillar — Walk

Other games (5)

• Brilliant Diamond / Shining Pearl (Gen 8): Route 225, Route 227, Sea Route 226, Stark Mountain
• Ultra Sun / Ultra Moon (Gen 7): Poké Pelago, Poke Pelago
• X / Y (Gen 6): Pokémon Village
• Black 2 / White 2 (Gen 5): Strange House, Unova Victory Road 2
• XD (Gen 3): Citadark Isle

Banette — full Pokédex entry