In Pokémon Brilliant Diamond and Pokémon Shining Pearl, players can make use of hidden moves in their venture to fill their Pokédex and fully explore the region of Sinnoh. One such hidden move is “DEFOG”. However, if you don’t get this hidden move, it’ll make some navigation in the late game very difficult. Defog clears away any fog on the field, as well as Light Screen, Reflect, Safeguard, Mist, Spikes, Toxic Spikes, and Stealth Rock. This guide will show you how to get “DEFOG” in Pokemon BDSP.
Head to Pastoria City and go to Great Marsh. Talk to the receptionist on the left, to take part in the Great Marsh Safari Zone. This move will cost a small fee to purchase.
Enter the game, and talk to the green-haired NPC that stands on the right side. After that, you’ll be able to use the move from your Poketch to clear away the fog that hinders your progress in a certain route like 210.