Where to catch Nidorina

In Johto & Kanto (Gold, Silver & Crystal)

• Route 13 — Walk
• Route 14 — Walk
• Route 15 — Walk

In Kanto (Red, Blue & Yellow)

• Celadon City — Trade
• Route 11 — NPC Trade, Trade, Walk
• Route 23 — Walk
• Route 9 — Walk
• Safari Zone — Trade, Walk

Nidorina — full Pokédex entry