Wobbuffet locations — where to catch

In Sinnoh (Diamond, Pearl & Platinum)

• Lake Acuity — Walk
• Lake Valor — Walk
• Lake Verity — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Cerulean Cave — Walk
• Dark Cave — Walk
• Johto Safari Zone — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Safari Zone — Walk

In Kanto (FireRed & LeafGreen)

• Cerulean Cave — Walk

In Sevii Islands (FireRed & LeafGreen)

• Ruin Valley — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Dark Cave — Walk

Other games (5)

• Brilliant Diamond / Shining Pearl (Gen 8): Lake Acuity, Lake Valor, Lake Verity
• Sword / Shield (Gen 8): Bridge Field, Dusty Bowl, Route 5, Galar Route 5, Hammerlocke Hills, Lake of Outrage, Motostoke Riverbank, Stony Wilderness
• Omega Ruby / Alpha Sapphire (Gen 6): Safari Zone
• X / Y (Gen 6): Friend Safari, Reflection Cave
• Black 2 / White 2 (Gen 5): Nimbasa City

Wobbuffet — full Pokédex entry