Spheal locations — where to catch

In Hisui (Legends: Arceus)

• Ginkgo Landing — Walk
• Hideaway Bay — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Sea Route 226 — Surf
• Sea Route 230 — Surf

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Shoal Cave — Surf, Walk

Other games (9)

• Brilliant Diamond / Shining Pearl (Gen 8): Sea Route 226, Sea Route 230
• Sword / Shield — The Isle of Armor (Gen 8): Frigid Sea, Giant's Bed
• Ultra Sun / Ultra Moon (Gen 7): Alola Route 7
• Sun / Moon (Gen 7): Alola Route 7
• Omega Ruby / Alpha Sapphire (Gen 6): Shoal Cave
• X / Y (Gen 6): Friend Safari
• Black 2 / White 2 (Gen 5): Hidden Grotto, Undella Bay, Unova Route 13
• Black / White (Gen 5): Undella Bay
• XD (Gen 3): Cipher Lab

Spheal — full Pokédex entry