Where to catch Dragonair

In Paldea (Scarlet & Violet)

• Casseroya Lake — Walk
• South Province (Area Six) — Walk
• West Province (Area One) — Static Encounter

In Johto & Kanto (Gold, Silver & Crystal)

• Dragon's Den — Super Rod, Walk
• Route 45 — Super Rod

In Kanto (Red, Blue & Yellow)

• Safari Zone — Super Rod, Walk

Dragonair — full Pokédex entry