Abomasnow locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 12 — Walk, Static Encounter

In Paldea (Scarlet & Violet)

• Glaseado Mountain — Walk
• North Province (Area Three) — Walk

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

• Polar Biome — Walk, Static Encounter

In Hisui (Legends: Arceus)

• Arena's Approach — Walk
• Avalugg's Legacy — Walk
• Bonechill Wastes — Walk
• Glacier Terrace — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Mt. Coronet — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Pokéwalker — Evolve

Other games (4)

• Sword / Shield — The Isle of Armor (Gen 8): Frigid Sea, Frostpoint Field, Giant's Bed, Max Lair, Slippery Slope, Snowslide Slope
• Sword / Shield (Gen 8): Axew's Eye, Dusty Bowl, Galar Route 10, Giant's Cap, Giant's Mirror, Giant's Seat, Hammerlocke Hills, Lake of Outrage
• Ultra Sun / Ultra Moon (Gen 7): Ultra Space Wilds
• X / Y (Gen 6): Kalos Route 17

Abomasnow — full Pokédex entry