Where to find Horsea in FireRed & LeafGreen

Good Rod: Cerulean City (60%), Cinnabar Island (60%), Route 10 (60%) + 12 more
Super Rod: Cerulean City (84%, FireRed only), Route 10 (84%, FireRed only), Route 11 (84%, FireRed only) + 12 more
Surf: Seafoam Islands (30%, FireRed only)

• Cerulean City — Good Rod, Super Rod
• Cinnabar Island — Good Rod, Super Rod
• Pallet Town — Good Rod, Super Rod
• Route 10 — Good Rod, Super Rod
• Route 11 — Good Rod, Super Rod
• Route 12 — Good Rod, Super Rod
• Route 13 — Good Rod, Super Rod
• Route 24 — Good Rod, Super Rod
• Route 4 — Good Rod, Super Rod
• S.S. Anne — Good Rod, Super Rod
• Sea Route 19 — Good Rod, Super Rod
• Sea Route 20 — Good Rod, Super Rod
• Sea Route 21 — Good Rod, Super Rod
• Seafoam Islands (B3F, B4F) — Good Rod, Super Rod, Surf
• Vermilion City — Good Rod, Super Rod

Horsea in every game · Pokémon FireRed & LeafGreen interactive map (Kanto)