Where to find Ditto in HeartGold & SoulSilver

• Cerulean Cave — Walk
• Johto Safari Zone — Walk
• Route 34 — Walk
• Route 35 — Walk
• Route 47 — Walk

Ditto in every game · Johto & Kanto interactive map

By game: Pokémon HeartGold map · Pokémon SoulSilver map