Piloswine locations — where to catch

In Kitakami (Scarlet & Violet – The Teal Mask)

• Chilling Waterhead — Walk
• Fellhorn Gorge — Walk
• Oni Mountain — Walk

In Hisui (Legends: Arceus)

• Arena's Approach — Walk
• Avalanche Slopes — Walk
• Avalugg's Legacy — Walk
• Bonechill Wastes — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 217 — Walk

Other games (6)

• Sword / Shield — The Isle of Armor (Gen 8): Frigid Sea, Giant's Bed, Max Lair, Roaring-Sea Caves, Slippery Slope, Snowslide Slope
• Sword / Shield (Gen 8): Dusty Bowl, East Lake Axewell, Lake of Outrage, Rolling Fields, Stony Wilderness
• X / Y (Gen 6): Friend Safari, Frost Cavern
• Black 2 / White 2 (Gen 5): Giant Chasm
• Black / White (Gen 5): Giant Chasm
• Colosseum (Gen 3): Snagem Hideout, The Under

Piloswine — full Pokédex entry