Where to catch Slowbro

In Paldea (Scarlet & Violet)

• Casseroya Lake — Walk, Static Encounter
• West Province (Area Two) — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Slowpoke Well — Surf

In Kanto (Red, Blue & Yellow)

• Cerulean Cave — Super Rod
• Route 12 — Surf
• Route 13 — Surf
• Route 23 — Super Rod
• Seafoam Islands — Walk, Surf

Slowbro — full Pokédex entry