Granbull locations — where to catch

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

• Coastal Biome — Static Encounter
• Polar Biome — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Route 6 — Walk

Other games (4)

• Ultra Sun / Ultra Moon (Gen 7): Ancient Poni Path, Poni Gauntlet, Poni Wilds
• Sun / Moon (Gen 7): Ancient Poni Path, Poni Gauntlet, Poni Grove, Poni Wilds
• Black 2 / White 2 (Gen 5): Hidden Grotto, Unova Route 2
• Colosseum (Gen 3): Cipher Lab, Shadow Pokemon Lab

Granbull — full Pokédex entry