Where to catch Seel

In Blueberry Academy (Scarlet & Violet – The Indigo Disk)

• Polar Biome — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Whirl Islands — Walk

In Kanto (Red, Blue & Yellow)

• Cinnabar Island — Walk
• Seafoam Islands — Walk

Seel — full Pokédex entry