Weepinbell locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 13 — Walk, Static Encounter

In Kitakami (Scarlet & Violet – The Teal Mask)

• Mossfell Confluence — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 224 — Walk
• Route 229 — Walk
• Sea Route 230 — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk
• Route 24 — Walk
• Route 25 — Walk
• Route 44 — Walk

In Kanto (FireRed & LeafGreen)

• Route 12 — Walk
• Route 13 — Walk
• Route 14 — Walk
• Route 15 — Walk

In Sevii Islands (FireRed & LeafGreen)

• Berry Forest — Walk
• Bond Bridge — Walk
• Cape Brink — Walk
• Water Path — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Route 24 — Walk
• Route 25 — Walk
• Route 44 — Walk

In Kanto (Red, Blue & Yellow)

• Cerulean Cave — Walk
• Route 12 — Walk
• Route 13 — Walk
• Route 14 — Walk
• Route 15 — Walk

Other games (4)

• Brilliant Diamond / Shining Pearl (Gen 8): Route 224, Route 229, Sea Route 230
• Let's Go, Pikachu! / Let's Go, Eevee! (Gen 7): Kanto Route 12, Kanto Route 13, Kanto Route 14, Kanto Route 15, Kanto Sea Route 21
• X / Y (Gen 6): Kalos Route 14, Kalos Route 16, Kalos Route 19
• XD (Gen 3): Cipher Key Lair

Weepinbell — full Pokédex entry