Where to catch Jigglypuff

In Paldea (Scarlet & Violet)

• South Province (Area Three) — Walk, Static Encounter
• South Province (Area Two) — Walk
• West Province (Area Three) — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Route 115 — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Route 3 — Walk
• Route 34 — Walk
• Route 35 — Walk
• Route 4 — Walk
• Route 46 — Walk
• Route 5 — Walk
• Route 6 — Walk
• Route 7 — Walk
• Route 8 — Walk

In Kanto (Red, Blue & Yellow)

• Route 3 — Walk
• Route 5 — Walk
• Route 6 — Walk
• Route 7 — Walk
• Route 8 — Walk

Jigglypuff — full Pokédex entry